They never made this for the D5500, so I made some masks out of the opaque plastic bag that paper comes in. It works very well because it does not 'shed' like paper or cardboard and it won't damage the glass like metal or plastic.

I set the masks on top of the glass carrier and hold it at the edge with a little piece of electrician's tape (that tape won't leave sticky residue).

You might want to try that if you can't locate the 4 blade mask.