No longer available and "NOS". On eBay! http://www.ebay.com/itm/152317178988?item=152317178988&viewitem=&vxp=mtr

Here is a very rare set of BOSCH Sport-FanFaren 6v Dual Electric Horns, a must have for anyone restoring an early Porsche vintage car from the 60's and 70's era . The kit comes complete with the installation harness, relay and cross-over switch. The cross-over switch if used, it allows the driver to select either the standard horn or the dual-tone horns. The horn installation harness can be omitted by simply swapping the car's existing horn with these dual horns by using the existing horn electrical circuit connection. These BOSCH Dual Tone Electric horns were used as an upgrade in early Porsche cars, including; the 356, Speedsters and 911s. Here is a short video of these 6v horns as well as the 12v version of the horns http://www.youtube.com/watch?v=6Aqb0kIbimc

FYI... For those who have converted their early cars 6v system to 12v as well as the 911's. By using a 'stepdown voltage' controller like this one here http://www.youtube.com/watch?v=l7DVyas-lkw one can easily use these 6v dual-tone electric horns in a 12v circuit.

Interested parties can contact me directly via email at AJSERRANO@msn.com ~ Thank you.