Relays to run both headlights (Non-USA Models), courtesy of Welshrob: the relays you need are 4 pin 12 volt 40 amp with a resistor (6800 also works but doesn`t have the resistor) for surge protection. The common type in Australia are made by Narva and the part number is 68004.
Link to an install of the Stebel Nautilus Air Horn on an S3. clicky∞
Another link to an install of the Stebel Nautilus Air Horn on an S3 clicky∞
Some helpful tips to install the Nautilus on a Sprint ST. clicky∞ (The schematic to use for an '02 Sprint ST, if you're going to use the stock horn switch and delete the stock horn, is the one in the bottom right hand corner of the directions sheet.)
**Disclaimer** - These part numbers are listed only as a reference. I have not tested any of these part numbers to verify that they work on the listed Sprint ST's. If you chose to use the part numbers listed on this page, you do so with the understanding that I will not be held responsible for any problems/damages that might arise from it's use.