80135 HK = 6cyl Belmont Station Sedan January 1968 - May 1969
80335 HK = 6cyl Kingswood Station Sedan January 1968 - May 1969
80135 HT = 6cyl Belmont Station Wagon May 1969 -July 1970
80335 HT = 6cyl Kingswood Station Wagon May 1969 -July 1970

80170_HQ = Belmont Panel Van 6 cyl July 1971 - October 1972
80270_HQ = Belmont Panel Van 8 cyl July 1971 - October 1972
8M70__HQ = Holden Panel Van 6 & 8 cyl October 1972 - October 1974
8WM70 HJ = Holden Panel Van 6 & 8 cyl July 1976

This is according to official Holden literature I have.

Based on what I have just read Oct 1972 to Oct 1974 HQ Panel Vans were not Belmonts?
I must say the literature seems to contradict itself.