Nothing to lose by posting a WTB in the EE.
Gotta be one or two residing under benches around the place. If a used one will do.
Who is the importer/distributor for Sako these days? Was that Stoeger? If there is anyone else, authorized repair facility, etc., they would be worth a try. Phone, don't email, eh.
Checked with Western Gun Parts?
Cheers
Trev