'75 duster windshield gasket

Hi guys, I am ready to put the windshield back in my '75 duster. The problem is, the local company I'm having put it in quoted me like $170 for the gasket and another $20 for some other locking gasket, or something like that.
I can get the gasket much cheaper online from mopar shops, but some of them say there were two gaskets, and others say mine has only one, only the earlier dusters used two. Year One doesn't even list one for a '75, and their tech guys said that there was only 1 gasket for a '74, which should be the same, right? This is why I'm confused. The only thing I have is the windshield and all the stainless windshield trim, can anybody tell me exactly what else I need so I can get this car on the road.

Thanks,

Will