I have a pair of aftermarket horns for sale. The 290Hz/345 frequencies shown on the box are correct for Pagodas, they come with the correct black grill, correct black DIN 85 slotted screws, and correct slotted bright screws for the tag.
They were never installed on a car, I used them for testing.
Add an aftermarket Bosch tag sold on eBay and they'll look like the real old expensive ones. Or install them while your old Bosch horns are being refurbished.
$60 now $50 plus shipping.