There are other ways to order one also... some places want the length from the end of the output shaft. I just push it in all the way til it pushes the seal and then back out 3/4".

68 Road Runner, 69 Belvedere, 71 Challenger Vert
340 barracuda, 01 Ram CTD, 95 Ram, 04 Ram, 85 Daytona turbo Z
66 GTO, 06 Magnum RT AWD. 07 Ram CTD, 07 Ram