I think from memory the best one's available are from the dealer. They are thick and robust and if you armourall them they'll last for yonks.
I suggest giving the dealer a ring to see if they stock the oem ones. I think that's what I did cos I had the same problems.
They are also easier to take off, say for instance if you want to synchronise your carbs etc
I did have a look
here but couldn't see them.
