G'day 'dddd' and gml
gml is right. Yours are classic examples of early 'red' greenies and fit between gml's chronologically. His red is an example of the first model (we think) and his yellow Is one of the latest of that shape.
I think I can make out that the spare chassis frame has the early style front axle beam pivot that is of welded flat plate and the other has the 'formed' pivot. This indicates the spare frame is slightly older.
Stooge around. There are a few threads on the dating of these things.
The G80 (and the bonnet cutout) is an afterthought as gml says. Gadge comments on this in another thread only last week- the G80 came along in the mid seventies and your machines are from the late sixties.
That said, I reckon maybe I'd keep it that way! The modification and the G80 is part of that machines history and the G80 in itself is an historic artefact. And it's a bit of fun! The most monster 'red' Greenie seen to date
A good find. Have fun!
Cheers
P.S. The drive clutch/pulley on the front of the 80 looks a bit different.
P.P.S. And the funky welded on pulley/clutch on the RH side of the frame.?? Might need to look into that......?