Wheel sizes on our Convertible demo car are as follows:
Make: Borbet A
Front 16 x 7.5" with et (offset) 20mm (no spacers)
Rear 16 x 9" with et (offset) 15mm (+25mm spacers)
Running 215/40/16 tyres all round at present, but will be fitting:
205/55/16 Front
225/50/16 Back
Red demo car (gold wheels):
Make: Compomotive RF
Front 15 x 7" with et (offset) 20mm
Rear 15 x 7" with et (offset) 10mm (+50mm spacers)
205/50/15 tyres all round
On the Mk2 demo car we have used:
215/40/17 all round on 8x 17 Image split Rims with 0 offset.
PCD 4 x 100 fitment with 25mm spacers on rear only.
This did require the front arches to be flared, due to the 0zero offset and 8" width.
You will be fine with 8" fronts if the offset is 25mm.
This website is really useful:
http://www.gtsparkplugs.com/WheelOffsetCalc.html
As is this one for tyre sizes:
http://www.kouki.co.uk/utilities/vis...ize-calculator