I am also tracking down the horn assembly p/n 22882-003 for my PA30 (s/n 30-825). My Piper supplier in Johannesburg tells me "minimum 4 to 6 weeks" but can't say where the delay is.
I've sent an email to Aviall, but yet to get a response (I do not have a customer number from them).
Does anyone know of a parts supplier that may have these assemblies in stock?
Failing that I am stuck with the 100 hour inspections until I get the new part - I do about 60 hours each month with this aircraft.