Original GM LATE 69 thru 72 Pontiac GTO Lemans and late 69 Firebird limited slip posi unit for factory 2.93, 3.08 and 3.23 gear sets. Will work on 3.36, 3.55, and 3.90 with a spacer. This is the standard duty 2-pinion unit. Looks real good thru the inspection window. Has been in dry storage for many decades. This is for use with the 7/16″ ring gear bolts. Any questions email or call 301-668-0101.