Will this replace the stock Horn in a 2020 Vespa 300gts?

If the Vespa has a one bolt attachment for the original horn, it may work!

Will this fit a 2008 sportster 1200?

It can be fitted under the steering column on most bikes where the stock horn is located....however, be cautious as the travel of your forks could cause the horn to bang into the fender. First horn I put on dented the back side of my front fender when I hit a pothole and the forks compressed. I have since remounted the horn on the inside of my engine guard bars. You can find hinged bar clamps for the engine guards to mount the horn to. Make sure it is the size for the diameter of your engine guard bars.

what is difference from Stebel 11690053 and stebel 11690039?

The "Compact Tuning" version (11690053) has a 'chrome' plastic shell that covers the entire horn. The more common version (11690039) simply has a silver coating on the diaphragm and horn bell.

Will this come with everything needed for a 2006 road king classic. And does it have the hardware to bolt where the original horn is?

I was able to bolt to the original bolt-up position on my 2003 Indian chief. I did buy as a set with the relay. I love it it works great beats all the little beep beep. Its a real horn that people take note of when you let it fly.

Nautilus Compact Tuning Chrome 12 V Horn

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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Description

🔔 Make your ride impossible to ignore with Nautilus Compact Tuning Horn!

UNMATCHED LOUDNESS - Blasts up to 115 dB at 2 meters—over 3x louder than typical OEM horns, ensuring you’re heard in any traffic scenario.
COMPACT ITALIAN DESIGN - Sleek, slim profile with premium chrome or black finish fits seamlessly on visible brackets for a modern, professional look.
TWIN TONE SONIC IMPACT - Dual frequencies (530 & 680 Hz) deliver a rich, attention-commanding sound that cuts through urban noise.
WEATHERPROOF DURABILITY - Engineered with OEM-grade coating and powder-coated metal parts to withstand 400 hours of salt fog and extreme weather conditions.
PLUG PLAY INSTALLATION - Comes with a 90° female connector and mounting hardware for quick, hassle-free setup on motorcycles and cars.

The Nautilus Compact Tuning Chrome 12 V Horn is a high-performance, twin-tone horn designed for medium to large motorcycles and cars. Featuring a sleek Italian design with durable OEM-grade coatings, it delivers powerful sound output (115 dB at 2m) and exceptional weather resistance. Easy to install with included connectors and mounting hardware, it meets European ECE standards and is built to last through extreme temperatures and 50,000+ on/off cycles.

Specifications

ASIN	B00CJJ49KM
Automotive Fit Type	Universal Fit
Best Sellers Rank	637,939 in Automotive ( See Top 100 in Automotive ) 964 in Car Horns
Brand Name	Stebel
Colour	chrome
Compatible with Vehicle Type	Motorcycle
Customer Reviews	5.0 5.0 out of 5 stars (1)
Fit Type	Universal Fit
Global Trade Identification Number	08007850002248
Item Weight	687 Grams
Manufacturer	Stebel
Manufacturer Part Number	11690053
Material Type	Metal, Rubber
Model Number	Nautilus Compact TUNING chrome
Noise Level	115 Decibels
OEM Equivalent Part Number	11690053
Style Name	Compact
Voltage	12 Volts

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