Rod,
I doubt you will find a heim joint with a longer thread post on it. Those RE bars are only rated 4.5" lift max.
Here's your longshot tho. First, call RE, and ask how long the threads are on their heim for the RE1600, I am gonna guess its the standard 1.75" of threads like the ones I have sitting here.
THEN! Call and talk to Kris at Oregon Motorsports 2000. See if he has any 3/4" x 3/4" LH heims with a longer post. He has a pretty good stock of heim joint stuff. Or you can do the research and see if FK makes it or not first. He carries all FK rod ends.
8830 NE Sandy Blvd
Portland, OR 97220
(503) 251-2925
If that dont work, we could probably get a longer thread insert to put in the end of the bar itself. Cause otherwise you're talking about replacing a trackbar and that'd suck to have to do.