I didnt like the look or the fit of the blazer tank so I got a tank from a 87 or 88 work van. The van had a TBI motor in it so the sending unit was already setup for an intank pump. Its a 20 gallon tank. It hangs down about 7 in at the deepest point and the back of the tank tapers up, which makes it look nice from the back.
I had to trim the bottom part of my frame rails about 1/4 inch for it to fit. I also had to move the rear crossmember back a couple of inches. I took it to an old school radiator/ gastank shop and had them soldered up the orignial filler neck and soldered in a new one on the top so the filler hose goes between the top of the frame rail and the bed. Then cut a hole in it to add a 0-30 ohm sending unit (20 bucks) for our stock gauge. I then loaded it up with an ep381 gm high pressure pump and its been supplying my 5.3 without any issues for 4 yrs now.
I havent seen anyone else run this tank But I think its one of the best options besides a custom one.
Graham