I have the detroit locker in back and think it is a clutch type in front.

 

What's the cost on said units?

 

THis may not be the best pricing, but it certainly shows your options.

10.25 & 10.5 : JTs Parts & Accessories, Justdifferentials.com

I found the 10.25 Lock Right at Rocky Road for $375.

Lockright (Lock Right) lockers, Powertrax, best prices, lowest cost locker kits

Also found this at Bronco Graveyard

1999-2008 Super Duty/excursion - 10.5" Rear Axle - 10.5" Differentials

Bang for the buck, I'd do the Lock Right in the one leg carrier, or buy a used Traction Lock and a rebuild kit.