hull repair

I need to replace the plug on my Daysailer 3
iv included a picture showing both the original and the new on i bought form DR marine.
The outer diameter of the orignoal is 7/8"
however hte new one is 15/16"
Do i have to bore out the hole a little bit? I would prefer to by a better fitting one if anyone knows where i can get on. otherwise anyone have recommendations on how to enlarge the hole?
https://docs.google.com/leaf?id=0B4gIxJorRQ7RZmRmZmQ1ZjctNGE2OC00ZTMyLWIwN2EtYTY3NTg5ZmY1NWUy&hl=en
iv included a picture showing both the original and the new on i bought form DR marine.
The outer diameter of the orignoal is 7/8"
however hte new one is 15/16"
Do i have to bore out the hole a little bit? I would prefer to by a better fitting one if anyone knows where i can get on. otherwise anyone have recommendations on how to enlarge the hole?
https://docs.google.com/leaf?id=0B4gIxJorRQ7RZmRmZmQ1ZjctNGE2OC00ZTMyLWIwN2EtYTY3NTg5ZmY1NWUy&hl=en