Thanks for the replies guys. Superiorbrew is correct, I live in Marquette, MI. The washers referred to in the MLT conversion thread are 5/8" and I need 3/4 (I used a 1/2" pipe nipple and ball valve). Marquette is still without Lowe's and Home Depot, though I believe there is a Lowe's coming soon. For the time being we only have a Menards. Their catchy little jingle "save more money at Menards" is, I believe, a reference to their depauperate inventory. By never having what you need, you certainly save al ot of money by shopping there.
CatchinZs: If you have an extra that you'd be willing to mail to me I would be very grateful. Let me know if there is something I might do in return.