New, stock, just works!
I also purchased new relay and fuse box. I made my own "harness" using AWG16/2 lamp wire. I should have used AWG14/2, as the 16/2 is a little thick.
Now the NB roof with glass window defogger just works!
Needed for defrost to work. Also need a relay for trunk. Regular Miata relay will work, don't need the one with eyelet. Need fuse block too if you don't have power antenna.