Called WH and they recommended I go to the hardware store get the correct length bolt, the head diameter will probably need to be ground down to fit inside the spinner.

Don't think to much of this. A bolt can always be cut to length, but not extended. Now I have to go out and find/purchase the correct length bolt.

Also just making a note, the True Turn spinner back plate was lightended, and the Dave Brown spinner was not. There is a noticeble difference in weight.