I rang my insurers (Admiral) when I put my white turinis on my car, which obviously have turinis as standard anyway......explained they were the same as the standard ones, same size, same shape, blah blah, but white and the nice lady said we dont mind what so ever.....
I reckon for your standard alloys, not 'uprated' 172 RS etc or aftermarket, on your car shouldnt make a difference as it would have been an optional extra from the showroom.
I'd ring to make sure and be on the safe side. The worst they can say is no....