16601 Butt Plate

[JonM]

Looking at some of the 16601 But plates and I’ve noticed there is a number below also. I’ve seen 1 thru 4, is this anything to reference a size or anything I should consider when purchasing? They are only like $25 but just thought I’d see if anyone had a guideline on what to consider.
Thanks

[AndyK]

Find the widest and longest one you can and get it. the numbers 1-4 do not matter in sizing. if they don't come w/ the screws and you can't find any I think I may have 2 for ya. good luck w/ the build... Andy