79-91 CHEVY 10 BOLT REAR CORPRATE 10 BOLT REAR DIFF COVER OEM GM VERSION COMES WITH 10 MOUNTING BOLTS 1 COVER.THESE ARE ORGINAL GM COVERS SOME 79 STILL HAD 12 BOLT AXLES THESE ARE FOR THE 10 BOLT 8.5 WITCH IS 1/2 TON TRUCKS AND K5 AND SUBURBANS UP 1991 IVE GOT 10 SETS OF THESE SO THERE IS A FILE PHOTO ALL OF THEM A STRAIGHT AND MOST WILL NEED THE OLD GASKET CLEANED OFF AND MIGHT NEED REPAINTED. IF YOU NEED A 12 BOLT COVER IVE GOT THEM ON A DIFFERNT LISTING