Barry,
I don't know if this is what you are looking for or not. Found it using the SEARCH function and the search words of "spare tire". It was in a topic posted in 2009 under the category about maintenance.
The company is Lippert.
Good luck,
HamRad
http://www.montanaowners.com/forums/...ad.php?t=35277
The above link is where I found the info. It was made by ExNavyDiver.
It is the last post on that page.
http://store.lci1.com/shared/StoreFr...unt2=254386544