I can machine you any size prop adapter you want for $15.00 + Shipping.

I machine my hubs from 6061 aluminum, the diameter of the hub where the prop bolts is 1 1/2". I knurl the prop surface and polish the hub when complete. I will also machine the hub length to fit your particular application. If you are interested in having me machine you a hub or would like to see some pics of my work, send me a PM

Scott