I really haven't seen a go-to list of things that are swappable between years, but more importantly haven't seen a list of things that changed between the years.
Interesting example here:
The seat belts in my 88 are pretty moldy, dirty, stained, etc, so I figured I'd jump on ebay and scout replacements and costs. I came across a couple different types, especially regarding the retractor mechanisms that sit near the floor:
Supposedly from an 89. Is it really?
Another, slightly different one, which is what I have in my 88:
I know ebay isn't the best source for parts descriptions, so questions are:
1. Did seatbelt anchors actually change during the late model run?
2. What else changed that we should be aware of?
I find this all especially interesting because my GW is so torn apart that it's been difficult to understand what is or isn't correct, like door panels, with their short (85 & under) vs long wood grain trim pieces (86 & above).