i would try ebay or calling junk yards.
www.car-part.com is a good place to start.
Give me an email, I have one that is nice.
Hi, email me, I have one, You need power or manual window setup?Check out Mopowerstyle.com/forums Look for Magnum GT/Late B body
Hi i have a red 1978 magnum door no power windows or locks email me