cb750a air box question

I just bought a 1977 cb750a and I need to find out where the vacuum line off the carb goes.  There is a little hole in the air box on left hand side that looks like it might go there.  Also, does anyone know where I can find the collar or nut for the 2 piece air box. I also need to find out where I can get the breather tube for the top of the air box. ( looks like a "s".)

Thanks,
Tim