You use the Granada spindles, not the control arms. Check the Falcon archives for a full rundown on this. Also, my understanding a full article on this swap is coming on this website...(finally!!)
[addsig]
I've heard a lot of chatter here about this Grenada spindle swap and I've done a little reading on the subject. Before I go out looking for a set of Grenada/Monarch spindles for my '66 Mustang, does anyone know whether or not the spindles off of a '72 'Stang will fit? I've already got a set of those.