I can't seem to find the part numbers for these. HA-66 shows them but I can't find a part number in the FSM.

I was hoping to find a part number and maybe be able to cross reference more modern ones that could work.

Ok...the FSM is misleading by calling it the intake door motor. I finally thought to go the way I usually end up going and I look up a part for the 300zx and since it's way more popular I can get somewhere from that. The words you want to look for are ACTUATOR AIR INTAKE BOX. That leads you to 27080 which maps to 27730-48P00 and 27730-48P10 for the 300zx and it seems to map to 27740-10Y01 for the J30 most recently.

27080 - 2774010Y00 - ACTUATOR-AIR INTAKE BOX - 01/1992 - 06/1994
27080 - 2774010Y00 - ACTUATOR-AIR INTAKE BOX - 06/1994 - 08/1996
27080 - 2774010Y01 - ACTUATOR-AIR INTAKE BOX - 08/1996 - /

I got 2 from the junk yard. What a pain to do the mode door actuator.