I had the same problem and found it easier to just buy a black one the then send it for hydro graphing. I will tell you, it may just be me but I think it kicks harder with the thumb hole. But man I look good carrieing it in the woods. LOL! I ended up building another gun with a Phoenix arms kick ease tactical stock and it took a lot of kick out of it but it still has the cheek slap. I'm gonna try putting a comb on it.
I'm pretty sure the thumb hole I got was a Boyd's, they were cheaper.
Good luck!