#12 in the pic below

basically, the corner of one of mine broke off, so only about 2/3 of the dowel is protruding from the oil pump, and into the block. I don't think its going to be an issue, still lines up perfectly fine, but if I can source this part without buying a whole new oil pump (no way in hell I'm doing that), then I'd like to replace them. Couldn't find a part number or source for the individual dowel sleeves.