Camshaft Timng Marks on 1996 Chevrolet Corsica

I am replacing Timing Chain tensioner. The Camshaft Gear Does NOT have Timing Marks on it. I have called ALL the local Auto parts stores, A'Zone, Advance, Orielly's, napa, etc. No one has a Camshaft gear that has the T. marks on it. Now what??? I am thinking I should go to junkyard and put one on TDC take it apart and mark my gear accordingly, does that sound ok? Jim

Asked by for the 1996 Chevrolet Corsica
i think the key ways go together get a hayne manaul to help you