As Blocker says. These were optional on HK GTS327 and HT GTS350 manual. Big, tough diff, equal to or tougher than a 9". Standard fare on Camaro Z28 or 396/427. Also found in Australia in Impalas and Parisiennes. South African HQ's with 350 SBC engines had them too. A 1967-1969 Camaro 10 or 12 bolt is the exact same width as a HK-HG diff and already has 4.75" PCD stud pattern (HQ-WB). The only difference is the Camaro has the spring perches in a slightly different spot. You can buy a new one of these from Moser complete with Camaro drums or bare or whatever with positraction centre, detroit locker, tru-track, air locker or whatever you like for under $2000 US. You'll probably find a 1970's Camaro or Firebird diff is the same width as HQ.
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