Also welcome "rodey"! I took both (NT-30M & NT-16F) of our Suburbans apart cleaned and replace/repaired control boards, and other parts. I found adventurerv.net to have a lot of the older as well as newer parts. The "Burner Orifice" you listed is common to NT-24 M/S/SP and NT-25 furnaces, and is listed in their parts manual
http://manuals.adventurerv.net/Subur...rts_Manual.pdf Good Luck on your repairs, should you need any additional information don't hesitate to contact me.