On my 2 original dana cars one the bulb seal runs 1/8 from end of bulb to driveshaft yoke, the other is 1/4. It works out to about an inch out. Do not make it 1" out from a bulb type seal, that is wrong. 3/4 to 1" from a flat seal. Things move more than you think sometimes, and too far in could maybe knock the plug out of the yoke.