Help...what is it?

Well, we're showing a lot of OTHER vehicles. Let's show what the pic in Kellyjohnson's photo actually is.
First, Kelly, from the back, especially with the lift gate open, these wagons pretty much look all alike. So it's pretty hard to tell whether it's a Chevrolet Chevelle (or Malibu); Pontiac LeMans; Buick Century; or Oldsmobile Cutlass. These particular wagons, as previously stated, were sold in the 1973 - 1977 model years.

Chevy Chevelle (+ Malibu; + 'Laguna)



Pontiac LeMans



Buick Century



Oldsmobile Cutlass Cruiser / Vista Cruiser



Now of course, there will be differences in grills, head lights, side trim for different years of the same model. I'm only showing 1-2 versions of each.