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.