hi has has anyone have some used Pro Race 1.2 for sale

These are ET 23, but it's only 12mm you'll get away with it, I do

Team Dynamics 13" Pro Race 1.2 & Yokohama A048. Westfield, Locost, Caterham

I wouldn't be able to get away with ET23 on mine,so needs checking properly before you buy.
ET23 on the rear of mine will make the wheel touch the arch with a 7 inch wide rim.

Can be useful:

http://www.willtheyfit.com/