Have come across a mono-leaf 12-bolt with the following details:
Cast date L66 (December 6, 1966)
Axle code QL1229G (3.31 ratio, non-posi, December 29 assembly)
It has the radius rod bracket on the passenger side.
Now I should point out, am not familiar with 67's, but a bit of research indicates this would've been fitted to either an SS (L35, L48 or L78) or a Z/28.
Without a corresponding car, obviously no way to say for sure which of the above it actually was from, but based on the original ratio (3.31 open), could any of the above RPOs be ruled out, or deemed less likely than others?