Hi Wombat,
Well, unfortunately, I can't tell anything for sure based on the pictures. Look for the pot metal ring around the back of the back window which would make your truck early, possibly 41, but maybe early 42. No key in either door (unless it is because it is foreign) means it is early, probably early 42. US ones had a single key entry on the passenger door just below the door handle on 42(most)- 47e. 41's had the key in the handle. Based on the grill painted and the widened fender wells, that makes it almost sure to be war-time built, eliminating 41 and 46. 42-45 is a pretty safe guess and I would lean toward 42.
At least that helps you decide on your parking light decision. I didn't know you were needing the whole assembly, thinking you needed just the lenses, but they should be pretty easy to come by on ebay. Check the condition of your headlight housings as they are somewhat prone to rust. You might find it wise to get two full headlight buckets with parking assemblys together 42-46.
Hope this helps, and wish I could be more definite. Hope you can locate the vin. This may also be different with an Australian version.
