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Yep I’ve replaced mine I used Hella sharp tone high and low mounted on the same bracket, just loosened the top panel
of the grill and managed to remover and fit the new pair.
i made a small loom up with spade connectors so it just plugged in the OE loom.

I didn’t need to use a relay as unlike some of the horns the current draw is below the threshold for the cabling , fuse and horn switch..  I think they were around £20 for the pair from eBay.

I just placed an order for £19.75 the same , direct with Auto Elec company, inc  free 3 day postage , paypal guest check out, UK stock &  I checked were same model M26 S as yours as not listed in their web page.

 https://autoelectricalpartsuk.co.uk/index.php?route=product/product&product_id=4055&search=3BB922000731&description=true&category_id=0

Good advice and wiring tip, thanks.

I share the same sentiments. My horn sounds weak. My Ford Cmax had a more macho sound. How is the horn sounding? I wish I could hear before buying. So the horn is tucked behind the grill? You only lift the black top cover above the grill to get access? Thanks

Same here. Just bought mine but the horn has to go. Have you replaced it yet?

Mine "replaced itself". By which I mean it was replaced on warranty as the 1st time I actually tried it, about 3 weeks in, it didn't work so I don't even know what it sounded like. Replacement is a joke though but when it's on lease...........

What's it sound like? Can you attach an audio clip?