Can any member advise me where the above components can be purchased? Would carby TR and TS components fit?

If I remember correctly, both are on the air filter box. Any TS/TR one should fit. Grab the whole air filter housing off a wrecker, should fit. Check all the vacuum hoses on the engine though, I bought a TP carby wagon years ago that ran like it was on it's last legs, fixing that bird's nest collection of vacuum hoses on the back of the engine - lots of leaks, brittle hoses etc - made it run much better. Trick is to remove them one at a time, measure the length, cut from 2m of new hose, install, move onto the next.

Thanks for the quick reply Mad Max. The thermal valve I am after is in the inlet manifold adjacent to the brake vacuum hose. I will try a TS/TR air filter box for the air preheat system.