where can they be gotten, if anywhere?
Welcome to the site.
This will likely get moved to the Forum for that model--but in the meantime--the best source in the US is Landis Zimmerman in Ephrata PA.
You can contact him at:
1450 Diamond Station Road, Ephrata, PA 17522
Tel: 717-738-2573
Landis is old order Mennonite and does not have a web site.
You can also try www.crawlerheaven.com (http://www.crawlerheaven.com)
There maybe cross over applications from other tractors. When this gets moved to the correct location the guys that know far more about AG's than I do will pick up on it.