Welcome to the Club. Check the functioning of the EGR and that "extra hole" in the TB is plugged (that rubber piece doe not have a hole at that position).
I would be interested in the roll bar brackets, but I'm still looking for a SWB factory rollbar. Can you reproduce those? Leave the three pieces separate for easier shipping?
Sometimes the cable just comes loose so there's too much slack for it work properly. I also found great 4door XJ seat covers at the JY, cleaned them up, cut a slit for the tilt lever and bingo.
I have each one on my three trucks but I think my favorite is the 10 slot.
Is your 21 slot NOS? I was lucky enough to find a NOS one in the actual AMC box.