BeerM3
SILVER Star
If you mean the thinner rectangular ones that button (plastic single use push buttons) to the body where it rests on the frame, that's 4147. Dimensions are at the top of that pdf. There are 2 holes each and they're recessed slightly so the head of the button doesn't protrude. Positions 4, 5 & 6 all use that same 4145 bushing, with the difference being #4 is the one that bolts from the top through the tub.