I like to sit high in my vehicles. Just always have. I've raised the seats up in every car and truck i've owned. I'm not tall (5'9"), just prefer the vision and more comfortable. So I decided with this cruiser, since I am making it how I want and basically doing everything from scratch, that I would build the driver seat mounted higher, by just under 2". Earlier in this thread I showed where I welded the front right mount on the cross bar up higher. For the other 3 mounting locations, my solution was as follows. On the rear mounts, I used the taller brackets made for the passenger side, and a nylon block spacer to get the height needed. If I had better welding skills, there was probably a more elegant way to do the front left mount by fabbing a taller A bracket, but I didn't do that. Instead, I used the left over shorter rear brackets to give it some height. Once I had everything lined up, I marked and drilled the holes, then welded in support brackets and captive nuts on the underside.
I actually bolted up the steering column and everything to make sure I wasn't too high and that sitting in the seat would work...seems ok. I sit up very high on my 1980 and it works well.
The rear brackets were a huge pain. There is no access to the underside of the tub floor because there is a support channel there. What I ended up doing was getting a super long drill bit, and drilling first through the floor, then down through the bottom of the support channel. It is there that I welded on bracket ands captive nuts. I then had to buy 90mm long bolts to fit all the way through.
Lining everything up:
Getting holes drilled and support sheet metal on the underside: