Well this is quite a thread resurrection!
If the sheaves are like mine, those diameters aren't made anymore. You may have to get them custom made. I did. Check with Ballenger Spars in Watsonville, CA. Great folks, they will know exactly what you are talking about.
Otherwise take yours to a
chandlery and have them look through the catalogs for sizes. Garhauer and Schaeffer (and others) may have them.