Dave,
I got a set of bronze oarlocks from Jamestown. Think they were Buck Algonquins, and the inner diameter is 2.25" . Nice and beefy.
I also just learned something IMPORTANT about this afternoon about the idea of having oars in half. If you place them on a dock (or deck,or any flat surface...) and the wind kicks up as it did here today , the UPPER halves now have nothing to stop them from being blown by the wind, since the blades are only on the lower halves... In my case this meant that BOTH upper halves caught a good gust and made a break for the Bay ! Luckily as soon as I realized they were in transit I was able to round up a posse of jetskiers and finally gave them a purpose in their lives...So what could have been disastrous turned out to be informative, and humbling,all at the same time....