I have a booking on KL within 90 days...I can select an EC seat, but it wants to charge me 121 Canadian dollars...
From klm.com:
Economy Comfort seat (available on intercontinental flights)
Recline: 15-18 cm/6-7 inch
Legroom: 86-89 cm/34-35 inch
Personal entertainment screen on most aircraft types
Hot and cold drinks (alcoholic and non-alcoholic)
Moveable head rest
Per flight (depending on the duration): EUR 60-150
Free of cost for Flying Blue Platinum members or if you travel on a fully flexible Economy ticket
discount for Flying Blue Silver and Gold members, and for SkyTeam Elite Plus members.