All of the ones I have seen are Chevy specific or aftermarket Chevy GMC kits. You could try YNZ in Redlands, CA. Kind of pricey but great fit. I installed one of their units in a 47 Buick convertible. That car had enough wiring to power the space shuttle.
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