I don't have a quiver where I need one any more. but on my old bow it seemed like the easiest thing to do is to either buy another quiver. I even found some foam that I cut to fit and then glued it in there.
When I had an Alpine Soft Loc I just bought new foam from Alpine Archery.
I now have an Apex Game Changer quiver that has rubber lining. No need for foam and a great quiver. Has more features than the Tight Spot for $30 less.