The default size for the Strega is 2.25 spinner That airplane is very popular here for pylon with about 18 locally in use and most will use aluminum spinners up to 2.5 inch and either standard or long styles.

If You want plastic I recommend the CB assiciates spinner sold by RJL. It is a superior single bolt plastic type with an aluminum back plate and a capture grove.

Generally the black color is preferable as it does not show the starter burn marks that most people usually end up with.

If you want a CB type I will dig up the link for both a long or standard syle and about eight bucks.

John