We had an AC Terra Tiger in the early 70's...tons of fun...
If I can make a suggestion...the Tiger works a lot like a current model commercial-grade hydrostatic mower, which can supply parts to get the Tiger running again...
I buy old mowers like this Cushman Frontline, and use the parts for old RV retro-fits...
Tires and rims from QuadRunners/Racers work well, too...
I have pics (somewhere) of various late 60's and early 70's era RV's we had new, including the Tiger...we bought one of every competitor's model when the Cushman design crew were developing the prototypes and factory accessories for the Trackster, and tested them against each other at Schwark Quarry, just outside Lincoln, Nebraska, where the Cushman factory was located.
Tons of fun...a dozen different RV's off-loaded from a car carrier, and acres and acres of rough terrain to try to destroy them on...
We'd throw the Tiger into a full-load lock turn, spinning on a dime, trying to overheat the drive system, to see what kind of abuse it could take before failing...
Just reminiscing...you'll have a bunch of fun with this one when you get it running...