[GAc10boy]

Originally Posted by gringoloco

For records keeping, I think they used moog es392r. Thread count/pitch is the same at 11/16-18, though I can't find info on taper with a simple search. Will need to do some additional research...

EDIT: Confirmed. It seems this part number is a viable shorter substitute.

73-87 outer (ES409R):

Length - 6.75"
Threads - 11/16-18(R)
Rod Type - Male
Config - Straight
Small Taper - .593
Large Taper - .676
Taper Length - .664
Stud Thread - 9/16-18

Scout II Outer (ES392R):

Length - 3.9"
Threads - 11/16-18(R)
Rod Type - Male
Config - Straight
Small Taper - .612
Large Taper - .703
Taper Length - .728
Stud Thread - 9/16-18

At first glance, the tapers appear different, but doing a little trigonometry yields the exact same taper of 7.125° (or 1.5" per foot). The stud length of the Scout part is .06" taller, or what I like to call negligible. My only concern would be if using the shorter, aftermarket sleeves is if you would get enough thread engagement between the inner/outer.

Thanks to Jake and his buddy for doing the initial research!

Super helpful info!