Just had a thought if these could be counted as a modification.
Would or could an insurance company wriggle out of any claim if these were fitted to my 997. There are not standard fit when the car is supplied new or in my case bought second hand, but are a recognised after sales supply item.
I bought them from an OPC in November and have only just refitted the summer ones. So far it's been a waste of money as we haven't had any snow this winter "" so far!