In case you didn't come back to this thread, 18" wheels work fine with 4 piston 2019+ front GM calipers: parts no 13545382 and 13545383. There are even very cheap aftermarket versions on amazon: https://www.amazon.com/Premium-Compatible-Chevrolet-Silverado-2019-2020/dp/B0CDKG23KN
Correcting myself: I just realized they have 2 products, one bracket for the proper 6 piston caliper upgrade for the front (minimum 20" wheels), and the other bracket for the 4 piston upgrade for the rear (minimum 18" wheels). And exclusively for a limited set of donor corvette and cadillac...
I saw those, and I know there's a small company who sells conversion kits, but I guess what you're saying is that we can fabricate, retrofit it ourselves?
And how would that work differently for the front and rear? Apologies if I missed an explanation of this somewhere else!
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