Is that all the parts you have? It would have had a positive ID decal on it right in front of the seat....


Probably long gone before you got your hands on it. Did the previous owners have the receipts and the owner's manual?
We know It's a Dingo, one of the early ones on account of the cage-over-engine and not the later full cage.
So, judging from the paltry info that the manuals provide it could be a:
285
285-01
285-04
285-207
Pretty sure this was a 285 produced strictly in the 1980s, might have been made in 1985 or so. They went to the full cage in the 1990s as best I can tell.
Some time around 1997 they introduced their new rear axle that was machined from hexagon shaped bar stock instead of round bar stock. All the associated parts had an "H" suffix added to denote that they were hex axle parts, such as "3941 Axle Bearing" replaced with "3941H Axle Bearing." --
Added for trivia.