Here you see their stock length:
Chop off the end, chop off another inch:
Weld the end back on:
After cutting the legs all to the correct length (individually fitting them), tack them into place with the slider in position. I used 1/2" tubes to space the main bar from the rocker panel when tacking:
Welding it all together and painting:

Naturally this required some trimming of the trim panel but it keeps them tucked up nicely:

Some construction shots:

Very little deflection while holding up one sided of the vehicle:
This non-slip tape from Home Depot works great: