They are shown on the price list.

Sometimes we have them drilled for the 6 bolt hub, but not at the moment. We have them undrilled, or drilled for a DA 50.

I can order one for you drilled, but drilling the backplate is easy.

Go to the hardware store and buy a 10mm bolt about 1" long, and a nut and a few washers. Bolt through the spinner backpolate and the prop washer and tighten down with the nut and washers so the whole thing is secure.

Use the prop washer as the template for drilling. Use a drill press so everything is square. If you dont have a press get someone else to help.

TF