Here is the link to the Hella catalog page with the switch used in the oem kit:
http://www.hellausa.com/maineng/NewL.../ElecProd3.pdf
The part numbers are 80590 for amber, 80592 for green and 80593 for red. (Hella part numbers)
These switches are rated at 20 amps which should be fine if you use relays.