it was on my audi a3 so not really relevent to the rocco. but i had 16x6inch wheels. the rears were banded to 8.5inch and front to 8.25 inch. The .25 of an inch is suprisingly noticable! all welds were ground smooth so no noticable weld on the outside and balanced with hardly any weights! i was impressed to be fair.http://www.bandedsteelwheels.co.uk/
his prices have gone up a touch since i had mine done.
not sure a vary useful pic, but here it is