I just purchased a new 93R17 FV yesterday, and I’m looking at getting a Boyds’ TactiCool stock for it.

Question #1: I read were some people have to get new bottom metal, and parts (screws)
How do you know if you need new parts ???
Other then waiting until you have it all in front of you, and then find
that it doesn’t all go together.(I just hate that !)
Question #2: is the model for the 93-E/MKII the right one ?? the “E” has me confused.