Thats exactly the site that has me confused! They are the one's that list early '37 & then late 37-40! If you go to their home page & then click on view it online then on gas tanks you'll see the issue.trees said:I just looked in one of Bob Drake's old catalogue and he lists only one tank (steel) for the 37 Passenger car and one for 35-37 Pickup and one for 38-40 Passenger and pickup. All are 14 gallon tanks. You can order a poly tank with 17 gallon capacity from Mac's that will work fine (I have one on my 36 PU). You can go to Bob Drake's web site at www.bobdrake.com, email at [email protected] or phone 800 221 3673 or 541 474 0043.