Swapping the cam plate & bearings in my 06 RK, figured I'd throw some new lifters and adjustable rods while I was in there. Bought an open box of 18538-99B lifters from an old timer for $30 - can't resist a deal. There are no part numbers on the lifters themselves, so I'm wondering if anyone knows if there are any distinguishing characteristics or marks on B lifters. Of course now I'm thinking - after the fact - that he box says 99B, but I really have no idea if what's in that box are the real deal or made by Mattel. Appreciate any insight.