The screws I've had that fit Suhls were the same size and pitch as Anschutz
54's which is 6 X.075 I made some headless screws to use bedding Anschutz actions using Suhl screws.
These things aren't real easy to find as most folks say they are, once you start looking them. I think Neil Johnson's ahs 'em at a fair price. Others ahve 'em at a ridiculous price, something on the order of 40 bucks a set!