From a buddy of mine:
"According to my Cessna 150M parts manual (Fig 22A, Ind 15) my 150 uses a Cessna p/n C622001-0102 taillight assembly. As near as I can tell, this light appears to be the same as a Grimes Model S."
Anybody got one? Or know where we might be able to find one? ...That won't cost a kidney or the 401?