When GM built the 3rd Gen Camaro, they installed T-Tops in some of them. Others they contracted out to another company to have them installed. The problem is, the T-Tops the contracted company installed were a different size than the GM installed ones. This is important if you want to replace the seals around the T-Tops to keep it from leaking. All of the places you turn to tell you the two different sizes and say you need to measure to figure out which ones were installed in your car. They don't really explain very well what exactly to measure. So, my question is: What exactly to I need to measure and what measurement am I looking for to confirm one installation or the other?
NOTE: Bonus points if you can post pictures of exactly what/how to measure.
Vehicle: 1986 Camaro IROC-Z 305cu TPI