Hey, I just took out my bridge pickup last night from my MIM jazz bass to see if a new pickup would fit in without any routing needing to be done. Unfortuntely I do need to file the pickup holes a little bit, but the thing I was wondering about was the material used to cushion or support the pickups from the bottom. It looked to me like a fairly stiff dark foam or "rubberish" seal. Anyone know what this stuff is or what a good substitute for it is? I'm changing pickups this weekend and I know I'll need some. Or should I just take it off the existing pickups and glue it on the bottom of the new pickups? Merci!