Actually, I thought that the pre-91 YJ models had the same size hole as the CJ. The YJ's didn't get 4.0 fuel injection until '91 and that is when they switched the tank hole. The 2.5L YJs had an in the tank pump that fits through the older CJ size hole. I read this recently when trying to figure out my 4.0 swap. I don't know if the tanks are the same size or shape though.
The straps will work the same, I have a 91YJ tank with electric pump installed in my 86CJ skid plate up under my Jeep. Don't know about the cost, bought my stuff from the junk yard. Hope this helps out. Later.
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