Ebay.

Pretty much the only place you're likely to find anything like that. TL01's are discontinued, and for quite a while.....There may be some transferrable parts from another model, but you'll have to make a study of that. Look up models that might still be around, at the same period the TL01 was around (most likely none, but it's worth a try), and find parts with the same number. For instance - the TA03 ball diff is a straight drop-in for the M05 diff, though Tamiya has never acknowledged it, and neither manual states it.

Tamiya has a maddening habit of just arbitrarily discontinuing models for no apparent reason. It's why I now purchase as much spare parts I think I will possibly need, as I can, for any Tamiya model I buy, just so I know I won't ever be out of parts if it ever does get discontinued.

From Seattle, eh?
I'm across the peninsula, over on the northwest end, about 100 miles away!