Need to get a new AP diaphragm for my carb and I am wondering if I should order the stock one or one of the "optional" stock ones. Stock one is 5BE-14940-18-00 I believe there is also: 5BE-14940-17-00 (optional) and 5BE-14940-19-00 (optional) From what I have searched for I see that they have varying lengths of studs on the AP diaphragms to increase of decrease the squirt duration, but I didn't find anything stating if one was really better than the other. A longer squirt duration would help with the off idle bog and rapid throttle openings wouldn't it? I am not even sure which part # is the longer squirt one. Thanks.