Early engines up to 1959 had a lot of different names over the world, most common is the 30DIN Hp engine (whats translated as a 36 HP SAE in USA). They use only 6mm dowel pins to keep the flywheel steady to the crankshaft, later models use 8mm So we teamed up and brought back the 6mm dowel pins. We've made them slightly longer as stock, to give more strength and they have no play, are not worn, nor plied, nothing beats new dowel pins! Sold in set of 8 pcs