[gringoloco]

Seats look good. Are you gonna remove the headrests?

Here's a few pics of what I did for the fuel filler on my pickup. The same concept will work for your Blazer. I just used the late model filler and covered it all inside the bed with a Blazer filler cover. To get the neck under the bed, I cut off the stock bend and welded on a piece of pre-bent exhaust tubing from the parts store. Used fuel filler hose to connect to the tank- works like a charm...