Best to specify your model. I'm not sure how many adapter variants there are.
Decide on any 2.5" HDD you fancy but check the thickness (Google the model no. if advert doesn't specify)
A thin 7mm drive may need a spacer or a thick one may foul something.
Just in case. Thickness is usually a problem in the main body of laptops. Optical adapters may take the 3 main sizes without problem.