I've never come across a condulet with 4 hubs before! It can't be a "T"... is it an "X"?
I'd think if you used all of those you'd be a bit over your pipe fill (as it looks like its either ½ or ¾ inch.. I've seen some funky things like this on old condulets that have the cover mounting holes diagonal instead of the standard ones common today..
I wonder if theres an insulating bushing or "red head" in that MC Cable....
-Randy