I used Competition Engineering ones. I bought the bolt-in kit for a Mustang and used the bolt-in in the back and cut the front off to fit the Maverick and welded the front. I did mine years ago. There might now be Maverick ones made by somebody but when I did it, modifying the Mustang ones was the choice I had. http://www.competitionengineering.com/ Do a search here on the forum - there are dozens of threads on guys that made their own or put in a set like I did. Either bolt in or weld in. Search as one word subframe and as sub frame connector. A search with just "subframe" brought back 10 pages of posts .........
I've used these on my 73 Comet.........bolt on and can be welded later if you choose. David http://www.jegs.com/i/Alston-Race-Cars/064/102419/10002/-1 also, link to picture of one member using same Alston sub-frames......... http://mmb.maverick.to/media/lh-subframe-connector-front-view.7588/#media
Chassis Engineering offer a set for $99 http://chassisengineering.com/index.php?route=product/category&path=19_208