ok...my tensioner is messed up...on it saids number 24501381...but its an invalid gm number...so im goin to order 24501383...Goulds Bros here in monti said that it had a rectangle key on it so i should be fine...should i go for the 83 one?

GM uses "Casting Numbers" on most parts. These P/N'* are used for assembly on the line only. Service P/N'* are used to order replacement parts. Sometimes GM uses the same P/N for both applications, but, most of the time GM does not.

so does that mean that the 24501383 is the part i need? the dealer wants 83 bucks and gmparts wants 39 but i dont wnat to order from gm parts nad have the key on teh back be different...the one at the dealer is the one i need...and he said the part number was 83...so are athey the same/