Info on previous threads; search under "paddle wheel" where JG Tech was quoted as supplier. However the part no you mention is for the complete valve assembly; if you only need the paddle wheel itself plus 'O' rings, the part no is 33/113/01 - (Raymarine no R69015).
If you google Airmar theres dealers listed.When my Raytheon packed up I contacted one of their dealers (cant remember which) and received an Airmar unit.Fitted amd worked perfectly.