I bought my RS1800 with mondeo si alloys on 15" and with 40 tyres on them, they still fowl the arch over bumps, its getting abit rediculas now.

Question is are Fiesta RS1800 standard alloys smaller than mine, or have I got too buy new dampers and springs to sort the problem? (Car has lowerd dampers and springs on it)

Thanks for reading, any help would be fantastic!