New Volvos 760/860 seat

A couple of months ago, i took one of this new Volvo 860 Globetrotter trim for a ride . Honestly, after owning my 3rd Volvo truck i wasn't very impressed and because the exchange rate to our Canadian dollar is bad 1.3 cad=1 usd, the price is kind of high, +180,000 cad . So, i decided to keep fixing my 2010/ 780.
But what impressed me the most was the seat; if i couldn't afford the whole truck at least to get taste of new truck comfortable ride . I ordered it through Volvo dealer, It took a month to get it, come from production Volvo doesn't it keep it stock. I installed it myself, simple 4 bolts and air line, still have figure out what for are the electric wires, heating maybe or ... "electric chair" for e-log cheaters?!
Still a National (2200 cad$ ) and i don't like leather, but comfortable cushion and it has some king of gyroscopic fast action leveling valve, adjustable, i don't feel the potholes anymore, feels like floating ,i'm not tired after 8-10 hours of driving ;I drove it for 3 weeks already and love it.

 

Bellow the part from receipt, as Nasriza mentioned it came without armrest, i had no clue needs to be ordeted separately.

NTS 4029276CH07B VOL 665

 

So, the armrest from my OEM National 2000, model, would fit on this one? But how to instal it, would have to cut a hole through leather, cushion on the side to reach the joint inside ? ? I don't really need the armrests, but im thinking why selling seats incomplete. Imagine buying any furniture or computer seat without armrest , sold separately for extra cost.