H4 headlight upgrade.. but to what?

Hi all , as a newbie I am a bit confused. I’ve bought a pair of H7 bulbs (as advised) for my 2017 t6 but they don’t fit.
The existing have 3 legs and the H7’s have 2 legs and narrower .
Am I missing something
To expand on the previous answers, the H7 headlight is the complete headlight unit mounted in the van. Lenses, reflectors and all.
It's quite straightforward to swap, the hardest part is finding a decent set for decent money but they're certainly out there.

Take a look at this thread here
 
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