Well shit. I didn't know that. So yes, these are from a WK (2005) then. From what I saw though, the seats are very similar, and the other write-ups I've found for the ZJ/WJ swaps were about the same as mine, except that I wanted to retain the power base from the WK. If I'd used the XJ base for the driver seat, the swap would have been about 10 minutes. Only reason I went with the WK base for the driver seat is because I'm 6'5". The XJ base is about 1" taller than the WK base, so WK gave me more head room, plus I wanted to give myself more leg room which meant some fabrication on the WK base anyway.
FYI, it is QUITE doable. I've got both front seats installed and wired for power. I'll do a proper write up later (once I'm done).
For now, no pictures
There are a few issues and a few options.
First, the WK bases don't line up quite right with the XJ unibody.
Drivers seat: front bolts line up well enough that they can be coaxed into position with a bit of force. The rear left bolt lines up perfectly (though mine was sheered off, so I'll have to fab something up). The rear right bolt is about 2" off.
Passenger seat: WK base doesn't line up at all.
Next, on the driver side, there isn't enough room for the seat due to transmission/t-case/driver shaft.
Solutions:
Passenger seat is easy if you don't need to retain the WK power base. I figure I don't care about passenger seat being able to go up/down or tilt, so I swapped the XJ base onto the WK seat and it bolts right in. This only requires removing 4 bolts holding the bases to the seats, swap bases, and re-install. If you have a power seat, you will need to trim the plastic from the right side of the seat to clear the seat belt tensioner. Swapping to the XJ base will lose you power up/down/forward/backward/tilt, but you'll still have manual forward/backward, and power recline, lumbar support, and heat.
Drivers seat is more work. First, you have to pound out the unibody around the transmission/tcase to make room. This took me about 10 light smacks with a 5lbs sledge and took about 30 seconds.
Next, you have two options. Either swap the XJ base onto the WK seat, in which case it's a direct bolt in (plus trim the seat plastic to clear seat belt tensioner, and possibly remove the seat belt tensioner pastic). This unfortunately raises the seat by almost an inch. If you're okay with this, go this route. If you want power base, the front and rear left bolt will line up, but the main bolt (rear right) won't. You'll need to install a new bolt through the unibody for this. For now, I just drilled a hole through and bolted it in, and will fab up some more structural support later.
In my case, I'm 6'5" so the seats never went back far enough for me. The WK base goes about as far back as the XJ, but I thought I'd take this as an opportunity to give myself more leg room. I removed the WK base and welded it back on about 3" further forward on the seat, to give me another 3" leg room. This wasn't necessary but as the WL base can go far enough forward to accommodate a 4' chinese woman, I figured I might as well move it all back.
You will have to retain the XJ set belt clips. If you're retaining the XJ bases, just leave the seat belt clip installed. If you go to the WK bases, you'll need to bolt the seat belt clips into the bottom of the seat. Also, if you modify the bases rear inside mounting bolt, make sure you re-inforce the bolt hole. The inside bolt is the one that holds your seat in the Jeep in the event of a collision. The rest are just for show
As for power, nothing to it. Red and Black wires on the drivers seat, and yellow and black on the passenger seat. I haven't hooked up heat yet, but I imagine it'll be three wires on the harness (ground, high and low). Will report back when I do a write up.
All in all, the swap took me about 3 hours, but only because I've got no fabrication experience. Welding the WK base to give myself the extra 3" leg room took 90 minutes cause had to let things cool off ever few seconds.
