Pre facelift headlights question

Snash7

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Hi im new to the forum ive been around for some general info and its been great and very helpful.
Ive got a slight problem with my headlights.
I went to change my dipped full and side lights, my passengers side main is h4 instead of h1.
Really confused me why there is 2 different main bulbs.
Can anyone shed any light on this.
Thank you in advance
Grant.
Audi a3 1.8t agu