Rubber battery pad for battery tray?

[Motoman]

I am in the process of completing my X-1 CR conversion ( http://www.rc-monster.com/forum/showthread.php?t=9022 ) and I need some rubber or foam pad for the battery tray. I can't quite seem to find what I'm looking for and I was wondering if anyone knew where I could find some. It's kind of like double stick tape except only on one side. If anyone can direct me to a place that sells stuff like this or can give me any suggestions as to what I could use on the battery tray to protect the batteries I would really appreciate it.
Thanks!
Steve