65 valiant top. Top seems to small. Normal?

This is a Kee top. Just returned an EZ ON top for the same reason. Starting to think I’m the problem, not the tops! I have it sitting a few feet away from my pellet stove draped across stools now. Seeing a lot of talk about steaming online. My installer is a 2nd generation upholsterer and is scratching his head. Was hoping to get answers here, but I’m glad if my journey turns out to help others. I’ll keep you guys posted. Thx for all input guys. So you know… the Kee and Ez on are very similar quality however the ez on was a slightly brighter white if that matters to any restorers