The small facelift one is bolted on and glued. Nice armrest btw. I have the same one. The heated seats buttons are normally in it if the car had that option. I fitted S14 seats because they have the back adjuster on the outside instead of the inside and have heating. The heated seat buttons from a primera also fit the armrest.
And so I've heard about the heated seats. Looks like in the European models (specifically scandinavia) the heat switches are just under the radio (instead of the hole). All cars seem to have them (along with headlight wipers or washers) over there. My '86 Sunny has heated seats which is pretty cool for a bottom spec 80's car.
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