Fabricated my own. Put AN-10 fittings on valve covers, ran braided hose to twin catch cans that are mounted just behind the radiator, off the frame rail. Ran draft tubes from catch can vent to ground. Works excellent. Fabricated frame mounting brackets to catch cans. Used Summit and bought the 1 pint Stef's (pn#STF-5115). The Stef's cans are the perfect size and fit well. Others are too large to fit in the place I put mine.
Only possible downside is elbows on valve covers will loosen over time and require re-fitting. Used the nylon sealing disc that came with the AN bulkhead fitting and they will wear and become loose. Will consider the better system for the V/C