i have 2 rearends what are they ? i know that there 12 373 posi 1st one has NF GM8 3894860 X ON RIGHT TUBE ALSO A PARTLY REMOVED BRACKET THAT LOOKS STOCK AND I CANT FIND ANY MORE #S ON IT 2ND ONE N1285542 CG G258 2 W GM1 ANY HELP THANKS

 

or a good web site that has all the #s for GM cars ? Thanks

 

Dont know if you looked here or not.
https://camaroforums.com/m_79309/tm.htm
Let us know what you find.