Fresh Water Tank Replacement

Proud Dad wrote:
I own a Terry Travel Trailer from Fleetwood RV manufactured in March 2004, Model 260 BHS. I need to replace the fresh water tank. Do you have any thoughts on where I can purchase such a tank that will be the right size and shape? We are in western Montana if that makes any difference, though I assume this will be in internet purchase, not a store purchase.

Thank you very much.