Welcome to the Forum!

There are 3, that I know of, different IG liner beads. Your liner manufacturer needs to know which one you have. Probably the best way to let them know which one you have is to send them a piece of the bead - a 1" piece would be enough.

They all fit, but don't 'lock' in correctly, if not correctly matched to the receiving track .

I've installed well over 1000 liners - feel free to ask me any questions