The last foams I brought were from kamtec models and were UFRA Pinks in double width which you cut down for the size you require.
The Ufra Pinks are 34 shore rating so ver soft.
To find on the Kamtec website put "1:8" in the first search box and "foam" in the second.
I am about to buy some more foams myself and am going to try the contact ones (Although I dont like they dont fill the whole wheel) but am gettting softested I can for the rear (35 I think) and harder for the front (40) due to the way my car handles and it being 2wd.
Note: Kamtec also do the shumacher contacts too.
I did try some foam I got from work this week, that idea is now scrapped
Still somehow made the A though.
What clue are people using to attach the tyres to the wheels????
Thats what I need help with.