For the life of me I can't find any identification on it. I seem to recall these as being transition models, i.e. square exposed frame but with thermoplastic tables.
You can't tell from the photo but the middle burner tube seems for a different grill. It was just flopping around, and when I investigated discovered it's too long. If I push it all the way back on the valve, and on the crossover tube, the manifold can no longer attach to the cook box, and the other burner tubes are then too short to reach their valves. A shame, since all the tubes seem OK.
I also want to come up with some kind of wide bracket that can be slipped over the frame and then run a bolt all the way through to the firebox. OR maybe just forget all of that and install a pair of brackets on the right side of the cook box that will retain it against that left cross frame member.
I'm going for functional on this, not looks.