Rubber bar mats...

So i just got myself one of the Holiday 5.3 cu ft freezers (which I love, 3 kegs, little footprint, I am an apartment dweller) and I decided to go the tower route (like i said, appt dweller, and my wood skills are good but not good enough for me to put them on display in my living room with a collar)... Anyways, I swear to god, i have seen rubber bar mats that have half-a-circle on the one side so it will slide up against a tower...

I'm not sure how to search for them, anybody have any ideas...

Go to your local restaurant supply store. They should have them.