Mark,
I just got measurements of the flange:
Prop hub thickness 4.5²
Bolt diameter 0.5²
Lug OD 3/4²
Bolt pattern diameter: 4.75²
Bulent

Thanks, Bulent.

Based on Paul's comment on HP, I have an email in to Craig Catto to
see what he says.  Thanks for the help.  Based on the label it sounds
like maybe 230 - 250 HP may be too much.

Mark