RE: Learjet .40 Build
You could contact TruTurn and ask if this spinner will fit your need. It's 2 1/4" anf fits the GP F-15 and F-14 kits
Only bad thing is it isn't white (available anodized Blue, Gold, Purple, Red and Black)
[link=http://www.truturn.com/cgi-bin/store/agora.cgi?p_id=tt2282b:13&ppinc=spinners130&exact_ match=on]TruTurn Spinners[/link]
Don