To make your own driver, you need four high-current high-voltage MOSFET transistors like the IRF530N, and two half-bridge drivers like the IRS2003. (Note: at least 100V GD rating for your application)
Then you need a PCB and connectors that can handle the current (which at 7A isn't a problem with 100 mil traces and 1oz copper -- if you can go 2 oz, so much the better!)
You also need a regulator that generates a 10-18V control voltage. 12V would be fine, and easy to make. Add a fast diode and a couple of 35V rated 100 nF ceramic capacitors per driver side, and you're done!