I got sick of rubbing at full stuff. So I did something about it.
Here are some of the photo's comparing the two control arms and a pic of them installed, also a write up on how to do it.

^ the WJ rear lower control arm is about three quarters of an inch longer (eye to eye) than the KJ. The KJ's bushings are 2.63 Inches wide. The front bushing on the WJ LCA is 2.81 and the rear is 3.11" wide. It is okay tho, most of the extra width comes from excess sleeve.
cutting and grinding was in order.
How to:
If you don't have a digital caliper (HF, Princess Auto), get one. If you still don't wanna get one, follow the steps below.
(disregard if you have your caliper) You need a way of measuring how wide your kj bushing is. Grab an M14 and stick it in the hole of your kj bushing. With the bolt bottomed out in the hole, mark the opposite side or notch it or do something permanent, so you have a physical way of telling you how much to trim off the WJ bushing.
Now that you have your "2.63 inch standard", place your WJ arm in a vice or clamp it down. Personally I found that the rubber parts of the bushing measured 2.63 from side to side. I used a sawsall (hack saw, or grinder as a last resort) to cut the extra metal sleeve off, almost flush with the rubber bushings on either side. Then I used a grinding wheel to flatten it out. The caliper will tell you when you have everything even.
Keep grinding until you reach that 2.63" magic number.... or until you can see the mark on your standard. Careful tho, don't get too carried away with grinding because if you grind too narrow, you will pull the bracket wings on your KJ inward towards the bushing (not that its a big deal or anything?), do a good job

And then you get this


I totally forgot to take a picture of the gap with the wheels on. It will follow soon, no worries.
So there you have it, longer rear LCA's at a budget price. I run a 32 inch tire and used to "just" rub at full stuff. Now it won't.