Front seat risers
You have a passenger side riser that has a slider on it that is not supposed to. In stock form, the passenger side didn't get sliders until the later YJ a and they then used a different riser that was shorter by the thickness of the slider or about an inch and a quarter. So where is the rest of the height difference? If I had to guess, your drivers seat is probably bent back a bit and when pushed to the rear position, it gets lower on the riser (as its sloped).... So from the eye looking at the tops.... Big height difference.
That's quite a bit of difference. I was thinking you might have some aftermarket parts in there. I am assuming you have identical seats also. As I recall there were height differences between oem and Bestop risers and adjusters. When I bought my '86 there was only an adjuster on the drivers side and I am pretty sure that's the way they came from the factory, and I think the heights between the seats were pretty close at the time. I have since changed seats and risers.
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