That turned out way better and easier than I expected from previous info!
What piece did you mean by "With the billet adapter all you gotta do is take the piece off the bottom of the stock wheel and install it on the grant adapter"? I don't remember a removable piece on the bottom of the stock wheel, unless you're referring to the plastic turntable thingie the sliding pins go in? If so, that would explain why the sliding pins remain behind. I expected they would be removed in favor of whatever system the adapter uses.
What piece did you mean by "With the billet adapter all you gotta do is take the piece off the bottom of the stock wheel and install it on the grant adapter"? I don't remember a removable piece on the bottom of the stock wheel, unless you're referring to the plastic turntable thingie the sliding pins go in? If so, that would explain why the sliding pins remain behind. I expected they would be removed in favor of whatever system the adapter uses.