Two sets of stock type valve stem seals, dual retaining rings, seems like no guide machining required with either of these sets. Same I.D. dimensions on both sets. Fits 350, 455, others. One 16 pc set of Fel-Pro, premium grade, Polyacrylate seals, 25.00 shipped in USA. One 16pc set (2-8pc pkges), of Victor, standard Polymer seals, #45403, 20.00 shipped in USA.
