Higher rear shock

The is no straight swap that I have seen. The Ltz/400ex/kfx rear shock bolts up but you need to drill the shock whole. And maybe some trimming of the fender by the airbox. I have a Ltz shock. All I had to do was drill out the whole. Also for the swap you will need Ken' bushing.
 
Only thing that will "bolt up" would be an aftermarket custom length shock. You would have to do some searching for lengths of shocks, Might find what you're looking for. IIRC, the YFZ shock is longer because most re-drill and cut the forked end off. I think in the topic "Cheap Shocks" has a good list, what needs to be done to fit, and how it makes the quad sit.