I had to get one of these for my MF-65. They are available from Agco. ~$18.00 3 years ago. So, $20.00 today is about right.
I got mine from my "local" MF dealer (still about 1 hour away... they do ship across the country.) I have found their prices always fair.
The Equiptment Super Store www.equipmentsuperstore.com
Toll Free: 877-FARM-PARTS 877-327-6727
BTW: PN is 184277M1 Elbow, Tube to Carb
This is for the Gas engine. (Carbs not on Diesels right?)