From what I can remember, USDM had filler plugs, other countries had heated seat options (2 plugs), and then the parking pole (1 plug) and rear fog (1 plug).
You want better seats, get red recaros. They are OG Honda and look hot as f**k. Who cares about heated seats its not a luxury car its a Honda. Your going to kick yourself in the ass and go " WTF Was I thinking" in a year from now when you replace them cus the OEM seats are gay as aids.