[CMOTD]

Can anybody help with a source of replacement aftermarket tyres (preferably urethane) for a Revell BMW 320i please?
I have one of these:
   

Front motored and not the world's greatest performing slot car but I like it. The rear tyres are shot and I am struggling to find replacements. Paul Gage does some (PGT-21137LM) but his UK distributor doesn't stock them and buying from Paul in Canada is way too expensive when you factor in postage costs.