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The rear valance uses 1/4-20 studs and nuts along the side, and 4 screws along the top. You can get a rear valance hardware kit pretty cheap.
I just installed mine last night on my 71.Here is the bolt/screw kit I purchased, Worked perfectly too.http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&vxp=mtr&item=231222180987