Pins are held by a circlip on the underside. Loose fit, without it they lift right out. They don't really "attach". Believe the base should be a stick-on to the hood, but some repros are rivited.
Drill small hole in hood (if not there, not sure of diameter), larger hole in underside of hood for acess to clip and clearing the retainer brakets the pins clip to (think it was ~2" - 2 1/2" dia), base stuck on hood, spring on top of base (base of spring larger diameter than top), pin thru spring, base and hood, clip on underside of pin.