I will only be buying the arches if have a problem when rolling rhe arches.
If i find somebody has fillered them and it cracks wile rolling I'd like to no I have a back up plan 
Don't roll 'em then and buy some "Sensible" wheels!! Save you a fortune and also our not weakening the cars structure...
Coz that's not why I bought the car. I'm not In to sensible cars. Otherwise I wouldnt be putting 8j wheels on it and wouldnt have bought a car slammed on coilovers in the first place.
Rolling ruin the structure of the car? I'm rolling them not cutting them. If I was worried about car structures that badly I wouldn't be driving round in a 1985 jetta.
