I looked a couple years back and no one was making a pre-fab kit yet, is anyone making this yet? Not really interested in the Dakota kit btw...

 

I haven't seen one yet in Mustang II but have you checked out No Limit Eng.'s 'Wide Ride'? I know that they've installed one of these in a '57 with air bags as I have seen it up close & personal.

 

have u looked at what Fat-man has to offer? they have kits just for the 57-60 f-100s

 

Both of these shops offer offer Mustang II kits for the 57-60's:

- Jim Weimer Rod Garage
- JPL Street Rods

I bought the JPL kit (via ebay) for my '59 F100. It uses a TCI crossmember, so maybe you can get a TCI kit elsewhere too. Google either name for contact info.