I have found an alternative made from nylon available from here:
http://ruanovaperformance.com/gb/pro...ion-nylon.html
I have emailed the company and they are willing to offer a cheaper price if a group buy can be arranged, this price will depend on the number of sets required.
The current price is £47.27 for a pair. Please stick your name on the list if you are interested.
http://williamsclio.co.uk/forum/atta...tid=7348&stc=1
