yes yj hard top will fit on a cj and vice versa. however yj hardtops were designed so the tailgate will swing open without lifting the rear hatch/window. so cj hard top on a yj will not allow you to open the tailgate without opening the rear window/hatch. does it all make sense as worded?
some one does make upper hard halves to fit a hard top but i am not sure who.
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