Sideoftheroad, Looks like by group action you have several choices to resolve your problem. If I were you I would go for the 3.5" red P-40 spinner from MECOA as suggested by scale only for me. A lot of p-40's had red spinners. I also didn't know MECOA sold spinners, so we all are learning from your question. BTY the black rings that John referred to are score marks that can occur when your electric starter cone slips on the plastic section of the spinner. If the spinner is all aluminum the score marks don't happen. Careful use of the electric starter (and a good rubber insert) will minimize the black ring problem. And lastly, the spinners with a single center bolt are fine for glo engines.