Keith
You need to measure (really accurately) across the inside of the centre hub (Roadster is 160mm) and put a straight edge across the inside from rim to rim (Roadster is 360mm). I would imagine that all recent centre hubs are the same size, although chrome wheels may be different, and the 160mm is such a tidy metric size that I'm guessing that at some stage in the past there would be an imperial measurement!!!!!!!!!
I can't remember the size of my wheels offhand (17"??), but I would be surprised if the +4 and 4/4 were exactly the same.
With a bulk order (to save on P&P), the unit cost would be 'around' £20. various colours are available, like Red/Yellow/Black/Clear. I gambled that the red would match, and it does, but also got the black one as a fall back. The black also looks really good, so I could vary it according to mood...........
For metallics and non basic colours, then the plastic would need painting to match, or left black.
Incidentally, I'm also working on a perspex wind-shield for behind the seats at MrsW's request, but like the spare wheel security device, it's proving to be a real challenge since I don't want to use bungee fasteners like the one which used to be sold in Miscellany, and I don't want to drill the car either. So I'm using the head restraint stalks as locators, but as yet it won't stay vertical. I'm having to do some special brackets..... but more of that later if I can make it work.
If successful it could be done for under £100.
