I did manage to visit Keith last night, and as well as a few lovely trinkets, I got a lovely front for my truck with working and complete air vents as well as the bottom half of a gearbox.
Looking at the newly acquired gearbox made me realize my original gearbox had a extra growth hanging out the side.

Can anyone tell me what it is?
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1942 Chevrolet C60L WO48 - (Workshop)
1944 F15A
1965 Workshop Platform Trailer, Binned ARN: 101-803
1967 Trailer, 1/2 ton AUST No 5 ARN: 154-748
1990 Perentie 6x6 ERV, ARN: 51-981