I installed the Hella twin tone ones. Needed to cut off the connector and splice in a new one, but other than that it was an easy install. looks like this; http://www.ebay.com/itm/New-Genuine-HELLA-3FH007424801-Loud-Red-Twin-Tone-Dual-Car-Horn-12V-118dB-/261578080078 Sean 1997 S6