73 Burban Interior questions

[swissarmychainsaw]

I just picked up a 73 Burb (!) and I'm looking to spruce up the inside a bit, like maybe getting it all sorta "one color" again.

The front is a bench in ok shape, the rear has an old dye job on it, that looks kinda scary.

One thing to note I need seatbelts (looks the the upper supports are already there!)

Question is this: What interior years are the best "bolt-in".

I like the idea of front buckets and a stock bench (circa 1989). Are those "bolt and go"?
What about newer burbs/tahoe/etc? Leather is nice!

It seems that since the gas tank is in the rear, the floor under the drivers seat is flat?

thanks,
Nick