Cam bearing cap question ('92 2.0L)
 

So inside the camshaft bearing caps, there are little metal sleeves (I don't know what they're called; never thought about it before) that the bolts go inside of. The machine shop that laved my head lost one of them. Regardless, does anyone know what they're called, or know their size, or happen to have an extra one lying around somewhere in the North Houston, Texas vicinity?