yea the width of most vehicles is pretty easy to find online, finding the hight of the bumper and grill is a bit harder
quick search says a jeep cherokee width of 67.7 inches
so at least that tells you a sami is too narrow and a cherokee is too wide unless your willing to cut one down and reweld it but at that point it would probably be easier to build one from scratch
Good luck!
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EDIT I just thought about the cherokee having fender flares so perhaps the front bumper is a bit narrower than the 67.7" listed as the width