Go here All Trailer Parts, Hydrastar, Dexter Parts, Dexter Axles, Brakes, Electric, Hydraulic, Springs and look under ramp springs. They are 1.5 od and about 13.625 long. I used one on a 4x6 top gate
with 2x2 tubing and mesh steel.
The L bracket is .375 x 3" x 11" cold roll (Cut and bend to...