The newest ones are square bore to accept those type hub kits. They have been produced in the past with a rubber hub and ones that use the T-Lok hub system. Are you looking at a used one or for a new one?
This is a brand new Stiletto Bay Pro III ordered yesterday from Iboats.
I removed the gaurdian hub kit (DE-501) as I assumed the Flo Torq III i already have would fit.
Hopefully I was right or I will be ordering the hub kit.