Aftermarket wheels are all essentially the same, they are a copy of the Chevy rally wheels and the centers are not designed for the factory caps. There are 3 basic designs, rally's, artillery, and smoothy's. Many suppliers have them in various sizes, bolt pattern, width, and back space. Some I am familiar with are Vintique, Speedway, Brothers, Truck Shop, Wheelsmith, and Summit.
I purchased mine from Wheelsmith and they modified the stock caps by cutting out the center ring and welding in a replacement ring that fits the newer wheel design. Some of these suppliers likely now sell the modified caps to fit the new wheels.
Fred
