I took my Buick to the local shop to get an estimate on replacing the black vinyl top on my 1972 Skylark. He hasn't been able to locate a one piece top to cover my 3/4 roof. The ones from his suppliers and Year One have a seam and not a single sheet. Does anyone know where to find that material? Is this guy not trying hard enough?
You could try calling Newstalgia Parts, they custom make every vinyl top, so maybe they would know what you need. They use the original patterns, and I have always been pleased with them. Here is a link to their website https://www.newstalgiaparts.com/Catalog/ShortProduct?productvariantId=59258 You can call them at 800-681-0710. They are located in Virginia.
