Interior and Upholstery 90-93 convertible seat belt upgrade

Hey guys. I’m in the process of swapping out my rear interior quarter panels from my ‘88 with the newer style from a 91-93 ones. I know I will need to buy the newer style seat belts as well. Is that all I will need to do the switch? Or is there any brackets that i will need to get for in behind the panels? Pics would be great too!
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