I understand you wanting to be sure that this is the correct part being as you appear to be in the Phillipines and don't want a problem getting a wrong part. If you order from Ryan at the link I posted you can rest assured that he'll take care of you...he is a very good guy.
From the last pictures that you posted I will say that the link I posted is to the correct part for your anemometer. The replacement is easy. Remove the allen screw that holds on the windcup assembly using the allen wrench. Remove the phillips (X) screw holding the old cartridge in place. Gently remove the old anemometer... you might have to wiggle it a bit. Slip the new anemometer back in. It should be a good fit. No excessive force is necessary. Replace the screw to hold the anemometer cartridge in its place. Attach the cups with the allen screw.
I will say that the link I posted is 99% the correct one for your application.
Ed