Guide Pole Pad Insulation

Do any of you know where to get the 2" , 2&1/2" , foam insulation? All Lowes has is like 1/2" hole to 1" hole in it.
Wonder if I'd have to go to like a Boiler Place ? Took the covers off mine and they are kinda worn where the rails hit it. I will flip it when I put it back on.
I guess you're wondering why I have them off? Gonna get my mom to make some slip covers up or them and send them to TimD to see about getting the Script Correct Craft screen-printed on them among other lettering. If it works out then, my mom will make the slip covers, TimD will screen print them and it'll be easier to ship, then all you do is slip your old covers off and put your 'New' ones on.
Still in the works, so be patient guys.