I've done a fair bit of work on my LJ78 running gear as well, and have yet to find a part that didn't cross over to either the 60, 70, 80 series cruisers or the mini truck. Get yourself an EPC (do a search on this forum if you don't know what that is) and learn how to find your own part numbers. The EPC will help you cross-reference the part # to other toyota vehicles, often NA spec ones. Then you take that number to the dealer, no probs.
Seriously though, you bought a vehicle that was never sold in North America...did you expect it to be a breeze to find parts? Look at it as a hobby. You've pretty much got to be willing to put in the time and effort to keep the thing running, or it's going to get frustrating and/or expensive. Having a second vehicle definitely doesn't hurt...