Hi friend, apart from a mainshaft outer seal or pushrod seal, this guy does a spacer with seal:http://www.ebay.com/itm/Shovelhead-Panhead-spacer-o-ring-leak-free-transmission#ht_1294wt_1249good luck, i have to do my trans stud again, maybe with JB Weld.
Bookmarked. If I have to get that deep in I'm going at it guns blazing with that in my arsenal. Bummer about your stud. On the upside, you might be the most patient person I know.
Lay it out here: