The base is made from square tubes that are 2 by 3 by 1/4 inch. Round 1 1/2 by .20 DOM tubing makes up the sides. The sliders are attached by 3 legs made of 2x2 square tubing . These 3 legs are welded to diamond shaped plates which are about 3/16ths of an inch. The installation does require welding.
These rock sliders will fit the 1991- 1997 Land Cruiser or LX450.