Where to get flat style door gasket for older empress

Hey guys I just picked up a used enviro empress with a 2006 production date. It has the old style flat door gasket that also holds the doog glass in. I know there is an updated door available, but I would rather not spend the $300 if a flat gasket is available. Does anyone know where I might find one ?

oh excellent, you're the man. How do you know which one of those is the flat tape style gasket ? I would assume is the the 91N 7' x 1/4-5/16, since that is the odd ball

That is the example they have on the site. That is a round gasket. So its not the 91N. I wouldn't assume. I would contact them like Daksy said and know for sure. Or order a "Flat" or "Tape" gasket from an online distributor.

There are a bunch of sites out there. This was the very 1st Google hit

http://www.northlineexpress.com/item/5RU-90/Grapho-Glas-Gasket-5-8-x-84-Flat-Tape

How big is the gasket? 1/2", 5/8", 3/4"..??