You might as well ask about where to find specific parts. A few of the Suburban-specific parts are reproduced. Most parts will have to be found on eBay or by posting Parts Wanted Ads in the Swap Meet.

The conventional-cab vs Suburban-cab differences would be in the floor-seat platform and the front seats and rearwards from the front seats.

I think that GMONIZ posted a good list of things to look for when buying a Suburban - it states which parts are Suburban specific. It might state where to find parts. Maybe GMONIZ or someone will post a link to that thread? It could be made a "stickie" at the top of the forum.