Ok, I was just curious. I do keep an eye out for them for you when searching around. Thunbholes are out there, because many people didn't like them when those guns came out and took them off. But that particular stock is the hardest to find of the three thumbholes.
If you're searching around, don't forget to search for NR stocks also. Some NRs came with 63 stocks and some came with 93 stocks.
Another option might be to find a 63 stock and just reshape the forend.