Carbon fiber PN database.

[basa]

Here are the OEM carbon fibers part numbers for both the 4 & 5 Blackwing. Use a variety of online sources to check prices such as Gmpartsdirect, GMpartscorp.com, etc.

CT4-BW:

Rear Spoiler PN 85561509
Front Splitter
PN 84433235(old)85563054(new)
Wheel deflector PN 84586281
Wheel deflector PN 84586282
Rocker Extension PN 84795019
Rocker Extension PN 84795020
Dive Plane PN 84996873
Dive Plane PN 84996874
Rear Valance Diffuser PN 84981410


CT5-BW:

Front Grille Header PN 86788444
front splitter PN 84432226
front side wheel deflector right PN 84490400
front side wheel deflector left PN 84490401
deflector kit PN 84624552
right rocker molding PN 84965190
left rocker molding PN 84965189
rear wing PN 85561511
rear diffuser PN 84981408

Seems like the part number for the rear wing has changed. Some sites say that part is discontinued.

 

[KatyTxCT5V]

Seems like the part number for the rear wing has changed. Some sites say that part is discontinued.

According to parts.cadillac.com, the 5BW rear spoiler new part # is 85517784, if that is what you are seeking. Jameson’s Viggen updated his post if I remember correctly around Jan 2023. I believe others also have posted the number changed if you search even further.

parts.cadillac.com has everything you need. Good luck.

 

[Lawineer]

I'm a bit confused.
Are the OEM carbon parts the same as the non-carbon option equipped cars, just in carbon, or are they different geometry?

 

[668LT4]

I'm a bit confused.
Are the OEM carbon parts the same as the non-carbon option equipped cars, just in carbon, or are they different geometry?

Different geometry. The non-carbon cars give you a plastic splitter, rockers, rear diffuser, and trunk lid. All are shaped differently in OEM carbon, and some of the pieces on the front end of both the 4 and 5 are only included in the carbon packs.

 

[VBhak]

Different geometry. The non-carbon cars give you a plastic splitter, rockers, rear diffuser, and trunk lid. All are shaped differently in OEM carbon, and some of the pieces on the front end of both the 4 and 5 are only included in the carbon packs.

"some of the pieces on the front end of both the 4 and 5 are only included in the carbon packs."

This is a very important point. there are small air deflectors on the bottom of the carbon splitter for the 5 with CCB that I had to order in order to piecemeal it together. There is another thread at the part numbers -- we believe they are important if you have the CCB.

 

[Lawineer]

Different geometry. The non-carbon cars give you a plastic splitter, rockers, rear diffuser, and trunk lid. All are shaped differently in OEM carbon, and some of the pieces on the front end of both the 4 and 5 are only included in the carbon packs.

got it. I'm trying to find differences in the carbon skirts, diffuser and splitter but they look really similar.

 

[Jafo2317]

Here are the OEM carbon fibers part numbers for both the 4 & 5 Blackwing. Use a variety of online sources to check prices such as Gmpartsdirect, GMpartscorp.com, etc.

CT4-BW:

Rear Spoiler PN 85561509
Front Splitter
PN 84433235(old)85563054(new)
Wheel deflector PN 84586281
Wheel deflector PN 84586282
Rocker Extension PN 84795019
Rocker Extension PN 84795020
Dive Plane PN 84996873
Dive Plane PN 84996874
Rear Valance Diffuser PN 84981410


CT5-BW:

Front Grille Header PN 86788444
front splitter PN 84432226
front side wheel deflector right PN 84490400
front side wheel deflector left PN 84490401
deflector kit PN 84624552
right rocker molding PN 84965190
left rocker molding PN 84965189
rear wing PN 85561511
rear diffuser PN 84981408

Are these numbers for a 2025 model?

 

[BlackDiamondCT5VBW]

I have been trying to get the rear spoiler and front splitter for a few months with no luck. After a phone call to Cadillac it appears the spoiler has been discontinued.

 

[668LT4]

I have been trying to get the rear spoiler and front splitter for a few months with no luck. After a phone call to Cadillac it appears the spoiler has been discontinued.

That's strange. I don't think the part changes at all for a 2025, so they must still be making them. I'll readily admit, I did not like paying for CF1 and CF2, but I sure love having them. My first car did not have any carbon, but I bought the rear spoiler for 3k on sale and put it on myself. The OEM parts are very good quality.

 

[Finally-a-V]

It might not be "discontinued". It's probably the supplier that's discontinued. That was part of the issue for 2022. They changed suppliers multiple times.