Made me measure, on a 79 tank from the front screw hole to the front seam edge I got 5 5/8" M/L and 4 3/4" to the floor. (tank sitting on floor with petcocks on, front seam on both sides touching the wall) I was measuring straight to the wall/floor maybe if I measured at an angle to the seam I'd get WER's number. YDMV