You're looking for ENG lenses to run on a Canon 7D DSLR? Or you want an ENG lens capable of covering an APS-C sized sensor like on the 7D?
I'm not aware of an ENG lens that is EF mount. Most ENG lenses are B4 mount. There may be an adapter to allow you to mount a B4 to EF. Further, if you need one to cover an APS-C sensor you'll have to dig into the tech specs of the lens as most probably aim to cover a 1/2" or 2/3" chip.
Also not sure, why you'd want to run a DSLR as an ENG camera? Amongst all the things a DSLR does, serving as an ENG camera is nowhere among them! :-)