Ordered the parts needed to build the power cables for the elements. Two L6-30 plugs some 10/3 wire and some cable and heat shrink wrap to make it look good.

Amazon.com
2x NEMA L6-30P plug
1x 25′ Coleman 10/3 bulk wire
1x 4′ 3M 3/4″ heat shrink tubing
1x 25′ Flexo PET 1/2″ Braided Cable Sleeve, Black