does any body know if the rear spacer for a TJ will work with a KJ
is the spring opening at the top the same size?

I am not worried about "loosing" a spring ,stock shocks, just looking for about 3/4" +/- boost but I cant find any thing like that for the KJ only the TJ
also bump stop extensions for the front what is provided with the franki or other kits that have them if any?
the rear is easy

A couple extra isolators per side, one top and one bottom should give you 3/4" easy. Dealer sells them farily cheap too I beleive. To answer your question though, I don't think the TJ and KJ spacers are interchangeable.
I have the front extended bumpstops from Daystar on my Wifes KJ, they are poly and about an inch longer than stock.

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99 TJ
71 C101
04 KJ
03 SFA KJ Sport
LOST JEEPS So-Cal

Thats a little to long for the bumpstop
and I was thinking that I would do the isolators
as fars as the KJ/TJ swap with the spacer I am looking for a 3/4 spacer for the rear of my TJ so when I do that i will just see if they fit the KJ if so I will just use them

The top spring pad for the KJ is about $10 each at a dealership. They stack and interlock really nice. You could add more than one to each side to get your desired height, they are between 1/2-3/4" thick.

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Early '02 Limited, Steel Blue, White Guts