I am working on build converting an older 116 from a 300WM to .240 Weatherby. I need a new bolt head but have the older .140 firing pin and slotted head index. I don't want to convert everything over to the newer small firing pin. What is my best bet for getting a new, correct bolt head? I have heard SSS is good but hard to get ahold of and most other places are out of stock or not caring what I need.

Thanks for any help.