By the way, the wood blocks with the offset hole go under the cross sill nearest the rear sill. The bolt hole in the frame at that cross sill position is not in the center of the frame mounting flange but is closer to the outboard side. With the offset hole in the block the block sits directly over the frame rail. You can use a block there with the hole in the center, it just makes the block hang over the outer edge of the frame. Not a big problem functionally. Also, notice that on an original cross sill the bracket attached to the bottom of that cross sill has its hole offset as well.
Mar-Ktech
