I can't put a number on either version. I just have a question on it though? Was the "service" version of the air cleaner, no studs, just a bolt hole through the top into the carb, ever supplied on a production car?
The cut off date on '68 GT350s is pretty much May 15, 1968. Is the recall notice dated after that?
It's my thought that the dual stud version is more desirable and that the single "stud" is a recall modification and would have been a service part?