After the "A" in the part number, the number corresponds to the appropriate trim level. So 1 is for an EX and EX-L, 2 is for an EX-L RES and 3 is for an EX-L NAV. So the last one you listed should be for a EX-L NAV. I would verify with the seller if the unit came out of a 2004 or 2005 NAV model before buying. Honda will change part numbers from time to time which is why you won't see the "A31ZA" model on eBay or from salvage yards. "A31ZA" is the part number you would use to buy one from a dealer.
Try car-part.com to search various salvage yards. I found a good number of units for '04s and '05's that start from $65. No pictures so you'll have to trust the description or the person on the other line. Hopefully you can find a yard that's within driving distance. If you go this route, make sure they have the security code as well.
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2004 EX-L NBP
OEM Running Boards, Window Visors & Other Misc. Accessories
Kenwood DDX7015 (Double-DIN Unit), KNA-DV4100 (Nav Unit), Directed 9" Overhead DVD/Monitor, Autopage RS-855LCD, AutoIntelligence BlueConnect (Handsfree Bluetooth Car Kit)
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