We get two on Roadsters Dave although they now reside on my Land Rover giving a very grown up sound. Have one of these dual tone airhorns now on Morton.

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Very compact single unit with integral compressor. Sad to say it gets used rather a lot as yet another driver fails to see the car.

I had a hobby refurbishing vintage horns both interrupter and awoogah types. Small selection below.

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I still have a few left including the deep sounding original Lucas Alto, similar to one on the right.

ETA: note the wiring for second horn on your +4 will already be there. Look for light green/white (live +ve) and purple/black (switched ground).


Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone