Ed, that looks like a Bernie Bergman fan on the pic you posted. Not the same animal.
The fan looks like it may be an actual 911 fan on the poster's car. Some people didn't install a fill in the conventional location. They can be filled with a fabricated filler in the type3 spot, if it's a universal case.
Or it could be fabricated into a valve cover.
The filler on "real" 911 fan/alternator modified to fit a type1 was a hokey affair. I eliminated it on mine and used the distributor hole as a filler, as I have crank fire ignition now.