Hey Robert. There is an outfit in Quebec, Canada that is selling a nose piece for pre-1970 150s.

http://www.aerofairings.ca/parts.htm

Right near the bottom of the page (which is not elegant!) is the part I am referring to - A154. It is both upper and lower matched. Click on the item and there's a (not great) picture. The price isn't bad at $965 Canadian dollars, so an even better deal for you!

Eric

1968 150H C-FCUT