I replaced every insert on my Top Card before I sent the playfield to HSA. And Top Card has a LOT of inserts.

Not a single one fit right off the start. I had to sand every single one of them, both around the perimeter and the height of the insert, and clean out the insert hole on the playfield. They have a molding number on the top that has to be sanded off also. It was a lot of work.

From other guys who have done this, I don't think anyone has ever had them just fit right in. They won't, at least height wise, because of the was the playfield was manufactured originally.