That's the stock anchor roller from what I can tell. The size and type of anchor you are going to want will depend on where and what type of anchoring you are going to be doing. The anchor roller can be easily change out if the anchor that is best suited to your needs doesn't fit or work well with that roller.
The type of bottom where you are anchoring and the depth will determine what you need. Also if there is current, ect.... Lots of variables.
That is a cool boat. Has a lot more vee than my 22 cruiser.