Dave Brown Products has had some problems with several issues, the spinners are just the tip of the iceberg.
Do yourself a favor and call Tru-Turn and get a spinner that actually fits correctly, it might be a bit more money, but it's sure less headache, and the products are superior to everything else.
Everyone I know that's ordered a DB spinner has problems with fitment... either the crank hole, the prop-notch, or prop/spinner nut, always a pain with DB, so I switched many years ago for TT and never looked back.