Headlight cans?

[McCoyAZ]

In a 4 headlight setup the cans that hold the lights have notches cut out of them that should correspond to the tabs on the headlight....at least I assume thats the whole idea behind the tabs on the bulbs and the notch in the can?

I was doing the halogen light upgrade today and the tabs on the bulbs do not line up with the notch in the light can....so whats up with that or does it even matter?

I could cut new notches I guess.