I've just grabbed some genuine floor mats from a Boxster with a matching interior for £30. They were used, have very little marks in terms of wear, but do have a few stains on the drivers carpet as you can see:
I bought them as a punt to see if I can get the stains out with a good steamer and shampoo.
Also, my local garage drilled out the screw that was rounded off in the bumper in no time and didn't charge me a penny
when we have the next sunny day, I'll go ahead with the parking sensors.
I'll let you guys know how I get on later with the carpet cleaning! When the weather's good, I may steam the inside of the Porsche anyway. The condition is flawless but it's good to know it's properly clean and fresh.