I have a 1968 Mustang and im looking for a 9" posi rear and housing. Anyone know what year and vehical is has the same dimensions?

 

I'm relatively sure that a falcon has the same width as the mustang, not too sure about mounting points though. Summit sells ready to bolt housings and third members, the housing is a tad over $1000, and the third member is about the same price, not too sure on the cost of axles or brakes. Not too bad for a brand new unit though.

 

Here you can find http://dfwmotorsport.com/Fairlane/9inchrearends.htm dimensions of 9" rear axle.