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I used the following:
https://www.lowes.com/pd/Hubbell-20-Amp-125-Volt-Black-White-3-Wire-Grounding/3739225
successfully with these two cables:
http://www.homedepot.com/p/Whirlpool-4-ft-3-Wire-30-Amp-Dryer-Cord-PT220L/202647860
http://www.homedepot.com/p/NU-CORD-50-ft-30-Amp-RV-Extension-Cord-94626E/206025578
I tested with the dryer cord first because it's the one off my existing dryer and I wanted to confirm 240V with my EVSE before buying the more expensive RV extension cord to hack (cheaper than buying the STW cable by the foot). Both cables took some force to get through the rubber grommet on the 20A NEMA 5-15R part, but it was doable. The only difficult part with using the flat dryer cord was it didn't fit through the rubber grommet. Separating the individual conductors made it much easier.
The hardest part is cutting/stripping the individual conductors just right so they can fit into the screw-down terminals in the 5-15R. Even then, the clearance on the screw-down terminals was so tight and getting 10AWG stranded wire into them will be frustrating as you'll inevitably catch a strand on something and have to re-twist the wire bundle. Should've tinned them in hindsight.
