A few parts interchange questions

[whitewallslick]

I would appreciate information on the following:

Stock wheel width & tire size for a '66 2wd 1/2 ton lwb?

I'm upgrading to 6-lug front discs, what year span of stock steel 6-lug wheels will clear disc brakes? I thought I saw that 1970s 4x4 stock wheels are same width as '66 wheels and are 6-lug?

Are any later bench seats an exact bolt in or are the 60-66 seat tracks unique?

What is the smallest power steering gear that works with the bracket kits that all the parts suppliers sell? I bought a 70 van auto/tilt column and want to do the power conversion at the same time.

Any help is greatly appreciated. Now that spring is springing I am all fired up to get my truck on the road.