Phil,
Off the road sells one - not sure how much bigger it is than standard and it is definitely not adjustable in length - so may not resolve your issue??
It does have a folding tip on it though, which is the reason that I bought it (I am yet to test this feature - give me a couple of weeks). However, with a higher than standard lever placement to use with boots and while standing, it does appear to be closer to the engine case than I would prefer.
At �32.90 - not the most expensive or the cheapest solution and I believe it is a TT re-sold item.
http://www.off-the-road.de/XT-660-Z-...0Z-Tenere.html
Cheers,
Dale