Call Premier and ask for Roth. He'll probably want you to bring the car for him to see before he does the quote so he can verify there aren't ancillary issues like frame misalignment, etc. I don't know what his policy is about bringing your own top to be installed. I recommend just having him order and install because then he handles any warranty issues that may come up. If you bring your own top he'd be within his rights to back only the installation, which means if you ever have a warranty issue with the top itself someone may have to pay him for labor to address it. I would expect that to be true for any shop.
http://premierupholstery.com/