Understanding BC Racing Coilovers Part Numbers

The four parts of a part number

A BC Racing part number is built from up to four segments, separated by hyphens:

C-165-BR-RA

Reading left to right:

• C is the vehicle prefix.
• 165 is the application number.
• BR is the series.
• RA is the top mount code.

The first two segments together identify the car, in this case a 2020 and newer Toyota GR Supra. The last two are the ones you choose.

The first two segments: which car it fits

The opening letter is a manufacturer code, and the number after it identifies a specific chassis. You do not need to memorize these. C is Toyota, A is Honda and Acura, D is Nissan, I is BMW, and so on through the range.

Two things about this half of the code are worth knowing.

A single prefix usually covers a whole corporate family, so Honda and Acura share one, and Nissan, Infiniti, and Datsun share another. Prefixes also follow the chassis rather than the badge, which is why the Toyota 86, Scion FR-S, and Subaru BRZ all sit under the same prefix. They are the same car underneath.

The number is a catalog index, not a specification. A higher number does not mean a newer car, a better kit, or a stiffer spring. C-15 is the 1993-1998 Supra and C-169 is the 1982-1986 Supra, so the larger number is actually the older car.

One modifier can appear here: a trailing E on the number, as in A-153E or A-78E. That E means the kit is built in the Extreme Low configuration, which reaches a lower ride height than the standard kit. The same part number without the E is the standard drop version, so A-153-BR-RA and A-153E-BR-RA are the standard and low versions of the same Accord kit.

The series codes

The third segment is the damper series, and it is the biggest single factor in what the kit costs and what it does. There are seven:

Code	Series
BR	BR Series
DS	DS Series
RM	RM Series
ER	ER Series
HM	HM Series
ZX	ZX Series
ZR	ZR Series

BR is the most widely fitted kit in the range and the one most applications start with. The others move up through progressively more specialized damper designs, and not every series is offered for every car, so a chassis may exist in BR and DS but not in ER or ZX. For what separates the seven, including how ZR and ZX differ, see our BC Racing coilover differences comparison.

The suffix codes

The last segment is the one worth getting right before you order, because it is what separates two otherwise identical kits. It tells you which top mount hardware is in the box, front and rear.

The codes follow a pattern. The first letter tracks the series and the second letter tells you the mount, so the same four options repeat across BR, DS, and RM:

Code	Front top mount	Rear top mount
RS, DS	Rubber	Rubber or factory mount
RA, DA, MA	Pillowball or camber plate	Rubber or factory mount
RH, DH, MH	Pillowball or camber plate	Pillowball or camber plate
RN, DN	Rubber or factory mount	Rubber or factory mount

Where the table says "or", that is not a choice you make at checkout. It reflects what BC builds for your specific car. Camber plates are only fitted to applications that support them, so a kit listed as pillowball or camber plate can arrive as either depending on the vehicle, and where a kit uses the factory mount there is no new upper mount in the box. If camber adjustment is the reason you are buying, ask us to confirm your application before you order.

The codes on each row are the same mount package in different series, so RA and DA are identical hardware on a BR kit and a DS kit. The RM Series is offered in the MA and MH configurations only.

Once you know that, a part number like C-165-DS-DA reads cleanly: the GR Supra application, DS Series, with a pillowball or camber front top mount and a rubber or reuse OEM rear.

Not every series uses a mount code. ER, HM, ZR, and ZX kits come standard with pillowball or camber upper mounts where applicable, so those part numbers simply end at the series, as in D-30-ER for the 370Z.

A small number of applications carry an extra segment after the mount code for something specific to that car or that order. If you see a code that is not in the table above, ask us before ordering rather than guessing.

Two common mix-ups

ZX and ZR do two different jobs depending on where they sit. At the front of a part number they are manufacturer codes, and after the application number they are series codes. Position is what tells them apart, so ZX-05-BR-RS is a Jaguar F-Type on the BR Series, while D-30-ZX is a 370Z on the ZX Series. Read each segment in place rather than hunting for the letters.

A shared application number does not mean a shared kit. C-165-BR-RA and C-165-DS-DA both fit the same GR Supra, but they are different dampers with different mounts and different prices. Matching the car is only the first step. The series and mount codes are where the actual buying decision happens.

Putting it together

Working through one more, D-30-BR-RS:

• D is Nissan.
• 30 is the application, a 2009-2020 Nissan 370Z.
• BR is the series.
• RS means a rubber front top mount, with rubber or reuse OEM at the rear.

If you know your part number and want to confirm the fitment, or you have the car and want the right part number, we carry the full BC Racing range and are glad to check it for you before you order.