You'd be better serviced by replacing it with a Suburban SW6DE 6 Gallon Water Heater seeing as Suburban IS Morflo/American Appliance.
But if you are looking for parts try these guys.....
LINK
Is it time for your medication or mine?
2007 DODGE 3500 QC SRW 5.9L CTD In-Bed 'quiet gen'
2007 HitchHiker II 32.5 UKTG 2000W Xantex Inverter
US NAVY------USS Decatur DDG31