Obviously, a man who's never owned a pre-'67 VW before! lol
+1 on eye protection. One slip and these things will fire off into orbit. They do a good job of puncturing the skin on your fingers too.
1) set headlam housing down into the chrome ring
2) one "end" of the spring you'll hook up into the curled lip of the ring, with the "bendy bit" down against the lamo as the above picture shows.
3) using fingers, pliers, etc mash down on the other end of the spring, forcing it "wider" and then hook it up into the lip of the headlam ring.
4) repeat until you've got it clipped all around.
viola!
optional:
5) realize that while the tri-bar headlamp
looks really cool, it totally sucks at putting light down onto the road at night and you'll have to go back and do the job over again with a
real headlamp.
good luck!