480LE with hub brake on tailshaft

[animals speed shop]

I know lots of guys convert the 480LE's with the ebrake assembly back to a regular 480le . So here is my problem ....I have most of what I want the e brake hub /the 480le that came with the original set up but I am missing the
tailshaft that the ebrake set up bolts onto . I can't even get a part number for one ....any transmission guy's point me in the right direction We are so close yet so far......any help would be appreciated....thanks