I found an AC Delco SF 552 (6450089) in my father's garage this weekend. The box says "heavy duty" and "12 volt 1-6 lamp" The flasher is light green plastic, round, and says Tung-Sol 224 on it. Any idea what it fits?

 

Apparently GM# 491391 supercedes that one. Might help you find out what it fits.

http://www.rmsautoparts.com/proddetail.php?prod=SF552

 

The 552 was the standard heavy duty flasher unit that fit most autos back in the late sixties and seventies. So to answer your question, it will fit a wide variety of autos from that era including your Olds. Cool find.

 

Thanks. I'll keep it then!