I have split electrical conduit, of the corrugated kind on RiTA. Also have a pair of Dave W's Mohair variety for when the plastic ones expire - they were to go on the +4.
Someone did make leather ones at one stage, but the price was rather extortionate. Many use part of an old inner tube wrapped around the rebound spring.
All you need is something that will keep the road crud out Dave...
Cheers,
