Sucks to hear about the coilover mishap, but if you want to tuck tire, you will need to do fender work, there is no avoiding that, unless you really want to have some sunk and ill fitting wheels. Even then though it won't even look like your tucking tire, itll just look like the wheels are just too small. If anything the Varianza's will fit much better vs the eurolines. Just double check pad heights because i am not familiar with the brakes on 3rd gen GS. I do know the 430's do have the 4pistons.

 

I think you should be able to fit the varianzas but you definitely need to do fender work to get it to fit, and it also depends on how low you go as well. Anywho good luck on your car build! excited to see how it will end up after the coils are installed