In the US these tracks are hard to come by. Parts are hard to find. Your best bet for parts is across the pond. BAVI makes all the armor you need. Not much of anything is interchangeable except the track suspension but not the jackshaft. I think engine parts you can get but other than that it is going to be a challenging project. Not sure where you live but there will be one at Tower Park next week near Lodi, CA. It is one of Littlefields former halftracks and is a runner.
Steve A.