Cutlass Bearing Replacement - Sizing

Hi,

I am repowering Meltemi this winter, replacing the Perkins 4-108 with a Beta Marine 28hp 3 cylinder Kubota based engine.

While I am doing this I am taking the opportunity to replace the cutlass bearing. My measurements indicate that the inside diameter of the shaft log is 1 9/16 inches. However, there does not seem to be any available cutlass bearings with this OD, 1 5/8 being the closest.

Is my measurement off? Are the shaft log and cutlass bearing metric? Did there used to be a 1 9/16 OD cutlass bearing size in the the late 1970s? Has anyone replaced their cutlass bearing recently and if so did you have this problem?

Thanks for your help.