When I replaced mine I leveled the rockers front to back, then from driver side to pass side, then cut brackets to fit underneath welded them to the rocker and bolted to the floor, but I bought full replacement from daynacorn, once I got all that done they went pretty good.
I bought a laser level and followed the manual specs. The Datum line is an imaginary level line that you measure from up to different parts of the car to assure it's level. We also built a 2" square tube frame for ours. Check the link in my Sig and good luck.
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