Anyone know if the frame widths are the same? Im trying to fit one of the larger mount-behind-axle tanks in. Here's what I got so far: 82-91 Suburban Capacity: 40 Gallons/151 Liters Dimensions: 35 X 28-3/8 X 13-1/8 inches 31 gallon size: Capacity: 31 Gallons/118 Litres Dimensions: 28-3/4 X 28-1/8 X 12-3/4 inches 92-96 suburban Capacity: 42 Gallons160 Liters Dimensions: 29-3/4 X 33-1/2 X 13-1/8 inches Includes the lock ring and gasket for the sending unit. The confusion is of course, that Chuck's chevy page says that in the rear of the C/K body in the pre 88's were about 42" wide- and I recall them saying that they widened the frame in the newer bodies to put the gas tank inside the fram rail. Any measurements would be greatly appreciated!