I found an original steel Lyman 66LA for my 1964 marlin 336 35 rem. It currently has a Williams sight. Can you use the same screws or need specific screws for Lyman. Anyone know a good source for steel screws for these??

To avoid wasting time the manufacturer would be my first call. I wouldn't be surprised if they sent them N/C. I've had good luck with Lyman that way.

They should be the same.