As to your inquiry you have a few options here.
Review the IFIXIT guide on replacing your drive and you'll find at the bottom a listing of HD's that you can use that IFIXIT sells - [guide|11716|IFIXIT HD Guide].
There are other choices from other sources I would encourage you to do some web surfing on Western Digital's and Seagate's web site to see what options they offer.
The only thing you need to be careful here is the height of the drive must not exceed 9.5mm (2.5" laptop drive). Review the IFIXIT dual HD kit above if you want to add in a SSD. and you can then create a Fusion drive with the two drives or leave them discreet.