I live in So Cal, and there are numerous suppliers here, CPP, CARS, ABS, OPG, Danchuk, Classic Industries, Truck Shop, etc. CPP doesn't manufacture anything, they buy or assemble kits just like most of the other suppliers. Sometimes you get the correct stuff, sometimes.....not.
The important thing is to get complete instructions and hope they have some technical expertise if you have a problem.
Fred


1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine