I have searched, but didn't find an answer to my questions below. But then I am an idiot, so I may have missed it.

On a 74, so same as MII.
I came across this on the Mustang II Tech site, but couldn't find any other information on using the Granada calipers. And yes, I am stealing this quote from there.

I can't find my old user id to post there, plus I am not sure how active that place is anymore. And this post was several years old.
"If you are interested in the 5 lug wheels, you can upgrade to Granada brakes, and get 5 lugs at the same time. I did this on my 1976 coupe, that I had before the Cobra. You need the Granada discs with bearings , from a wrecking yard, and the brake mounting brackets. Your Mustang calipers will fit the brackets, or you can use the Granada calipers. You will need larger wheels, but that is the point of the 5 lug upgrade, to go bigger than the 13 inch wheel. I might do this on the Cobra, I have seen a Monarch in the pick-a part yard. It should have the Granada type brakes. You will need to use the Granada brake pads."
Question I have is has anyone done this using all the Granada parts? I've seen several posts where it mentions using an aftermarket mounting bracket and a metric GM caliper, not wanting to do that if I don't have to. The Speedway kit I have planned on getting does use the GM metric calipers. Obviously the author of the post I am quoting didn't mention if he had to make any changes to use the Granada mounts.
Current plan is to get the Speedway motors kit, but if I can do this using all Granada parts that would be more fun. And cheaper most likely. Also easier to remember what to get when replacement time comes around.
Somehow I am doubting this is that easy, or else why are the adapters being sold to use the GM calipers?
Thanks,
Russ