Schumacher racing sell foams for 10th tourers etc :
http://www.racing-cars.com/sp/catego...rbon_Rims.html
Depending on the car , 30mm rears might be to wide. I tried some out on my Schumacher MI4 CXL touring car and found they hit the shocks on the back. 26mm are fine all round. Shore wise you`ll want 35/37 on the rear and 40/42 front.
What car is it for ?