Having just changed the front and rear (same pump) washer pump, it's quite an easy job as they just push-fit in. All you need to do is move the engine cooling header tank to the side and lever it out.
A lot of online ePER is broken, but here I found out the p/n for the headlight washer pump: http://auto-kat.com/index.php?route=saleepc/alfa/parts&modification=T6&subgroup=55514_00
This shows as being compatible:
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