Use 5w/3w 12vdc LED on 60w 12vac cdi ignition
Looking over the (extremely little) information given ot the pages you linked; it looks like you'll want to get a combo regulator/rectifier &amp; set it to 13.8V or less to protect from ac &amp;/or overvoltage damage.

As for blowing the LED with overcurrent: Unfortunately, they don't specify whether the headlight module inclides its own current-limiting resistor(s)/supply, so while it is generally assumed that such a device 'should' have its own protection, there's not much way to know until you've used it for a few hours.