K12 1.2 alternator

Hi, I'm in need of some help. I apologise as I'm not extremely clued up on cars. I have Nissan Micra Urbis 06 1.2 litre. I need a new alternator which I have purchased but I've just realised it says on the description "none A/C type" so I'm guessing that means air conditioning (if not please correct me) anyway is this compatible with my car as its being sorted this weekend and last thing I want is to take it out and it being the wrong part! it's driving me crazy as my lights flicker and dim, electric windows are really slow just loss of power. Alternator is dropping to 12v when electrics are on (mechanic says) battery was all good he says.

Any advice is appreciated :) thank you.
 
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