For high-pressure hose, I used SAE 100R5-8, 13/32" ID, 2000 psi, 1-wire (blue jacket). Cut w/ hacksaw or cut-off disk to 21" length.

A better choice might be SAE 100R3-6, 2 fiber braids, 3/8"ID, 0.75"OD, 1125 psi (Gates 6G3HXCTN), since more flexible and still adequate pressure. The factory hose had fibers, not steel wire.

For return, I used Parker 611HT-8, 1/2" ID, 400 psi (black jacket). Another choice is SAE 100R6, 1 fiber braid, 1/2" ID, 400 psi (Gates 8GTHXCTN).