Howdy,
I work on a lot of ASM revolvers and it took me a long time to find the parts.
I agree on Gunworks and VTI, good people and fast on the parts they have in stock. If neither of them have what you are looking for, try:
Deer Creek Products
6989 E Michigan Rd
Waldron, IN 46182
(765) 525-6181
They have no internet site or e-mail. So you have to call them. I did and they assured me that they have a good supply.
Every thing I ordered came in correct.
They also have a supply of new revolvers at good prices.
Good Luck,
Lee