Call Hugh @ Safari in GJ. Might be able to help with some OEM parts. Also I bet you could scrape up some free bald tires in GJ from a tire shop that has to pay to haul them away anyway.
Speski OffRoad LTD, Cargo Solutions for Toyota 4x4's http://www.SpeskiOffRoad.com
"80 series, with a fridge"
1976 FJ40, Project with little progress.
2004 Starcraft 10RT