They will have the correct size sieve for that cheekblock. The block looks like it is rivited together. You will have to drill out the old rivit shaft to replace. How do you plan to put it back together? I'm sure you will void any type of warrantee doing this. Size 60 is a pretty good size block. How did the block fail that you have to replace?
I have used Ronston along with the other block makers on the market. They seemed to be built pretty good as the other manufactures.