This has got to be the best £20 I've spent on a car in a long time ....
Search Ebay for " Alloy Wheel nut chrome covers ".
They are chrome coated plastic and the 19mm ones fit my Cayman bolts. I cut the length of them down by maybe 6mm or so as I thought they were a smidgen too long , but that was just my preference, only took 10 mins to cut the 16 with a junior hacksaw.
I now have shiny bolts instead of rusty looking things.
Search Ebay for " Alloy Wheel nut chrome covers ".
They are chrome coated plastic and the 19mm ones fit my Cayman bolts. I cut the length of them down by maybe 6mm or so as I thought they were a smidgen too long , but that was just my preference, only took 10 mins to cut the 16 with a junior hacksaw.
I now have shiny bolts instead of rusty looking things.