Yes.
http://www.go.Jeep-xj.info/HowtoHeadRests.htm
Or you can swap in ZJ or WJ rear seats with very little modification.
try unscrewing the back light covers and replacing the lights
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driver side on the back of the motor where is crak sensor on 94 jeep 4.0 grand Cherokee
fuse 22
Yes
They are 5.25"
Drums
It is bolted on the back of the engine.
back side of the starter its self
yes I've seen it on two other jeeps but you might need a spacer for the back if you get th 20x10
when you open the hood of your 1991 Jeep cherokee, look at the right side fender( drivers side) you will see a black box mounted to the fender well behing and next to the air box,. that is the Electronic Control Module ( ECM). I hope this helps.
On the headliner just above the back of the passenger seats. 5.25"