Jack screw lower support

Can any one give me the size of the tube or reference # I can look up for the short vertical tube that the lower end of the jack screw fits into? This is the tube that is welded to the last horizontal cross tube between the upper longerons and is just above the pulley at the end of the jack screw. I am adding the jack screw to my 2+2 and need the tube size. I have the Northland CD, but can’t seem to find the size of this tube.
Thanks,
Marty

My 2+2 site with new pictures: www.xanga.com/martyfeehan

On drawing 12183, you should see Figure 6, which then tells you to see section S-S. I believe that is what you are looking for. Bushing 80022-20. I.D. .375.

Thanks for the info. You really know the drawings well! I looked through them last night and could not find the part, you were right on the money!
Thanks,
Marty