builder459
There are a lot of the older Knights that use the HPH-12's. Back then under the the original owners they bores were larger than todays GM standard.
My Knight MK need the older thicker short black sabot. And a few of the original DISC's came with the larger bore...
OOPs! he has an Elite you might be right on that one... Althought Tom's Elite 50 is just under a .504 bore...