1976 Suburban Qs

[eyebuzz]

Hello,

I've got my eye on a 1976 Suburban:

Some questions:

1) Were all suburbans designed for a third seat? Or if it was originally ordered with no third seat you couldn't add one later? (From this message board I can see that you can pretty much do ANYTHING...but it is nicer if it already built in).

2) Are most/all parts easily available? (alternators, distributors, brakes, etc.)...I guessing yes, but what parts are hard to find? Is a 1976 all that different from a 1991 in terms of parts/availability?

3) When did three point safety belts come in? Only on the front seat or all around?

Thanks,

TT