Hi, I asked you before about rear shocks for the kle, i thought I'd share my findings.
A klr650 (tengai) shock will fit the kle, it is longer (400mm total) but the other measurements are the same, you will need some spacers for the top connection because the klr has a narrower connection. Bolt sizes are the same.
I've also found some interesting exhaust things, an er-5 exhaust will fit the kle, and solves the a-symmetry, but the bash plate will not fit. There is a dude in Germany who sometimes makes symmetrical stainless steel manifolds for the kle (http://twin500.net/index.php?page=Thread&threadID=6296&pageNo=9)
I hope this information will help you or other kle riders!