Another thread contained information about this firm in the UK that manufactures seals and weather stripping made to order. I have shared the images below with them. This shows what I believe are the original windshield gaskets (or a replacement that was available in the early 1990's when the windshield may have been removed from my coupe. There is substantially greater space within the seal for windshield and molding fitment.
Still planning to return the vehicle to the shop in the next week or two, along with the original windshield for sizing comparison and next steps.
Still planning to return the vehicle to the shop in the next week or two, along with the original windshield for sizing comparison and next steps.