[Mr70]

Well I see I made a mistake,it was a color specific carpet code after all.And your's could be an anomaly too.
After getting home from work,and rechecking my notes,these are the carpet codes I have come across:
*C6323 was a black ft. carpet code for a Benchseat w/Floor shift.
*C6330 was a black ft. carpet code for a Benchseat w/Column shift.
*C6299 was a black ft. carpet code for a Bucketseat car,be it with or without floor console.
All three of these used black rear carpet code of C3466.

Your buildsheet seat code of 791 is an Ivory vinyl Bucketseat callout,which normally took a C6299 black ft. carpet.But it also shows it was assembled with a C6330 Benchseat Columnshift carpet and it also doesn't show any of the bucketseat or console RPO codes either.

Possibly a factory typo on the 791 code,or someone tampered with your buildsheet or car.
My computer screen isn't the best,but your buildsheet looks good to me from here..
I don't know your details,so can't say if you got ripped off or not.Take a look at your Cowl tag ontop of the driverside firewall and tell us what the seat code is.
It will be the first character on the first line and look like ST 791.Also check the floor under the bucketseat mounts for welded bkts. on either side,as the factory would've done it that way originally.