The wiper seals just push on to the metal flange and are secured by a screw at the ends. The bulb seals slide into the mating part of the slide flange, and the screws holding the corner plastic pieces need to be removed to allow the seals to slide out and new ones to be slid in. The seals are ordered by the foot, and come as a continuous piece. I am pretty sure they will be the same as mine on a 2012. This is the order for the seals I ordered 2 1/2 years ago from Trekwood and what I paid for them:
Product Quantity Total
Seal - Wiper - Off-Set TPE - Clip-On - 1225'/Bx [Keystone 186422]
36ft $123.12
Seal - Bulb - Extruded Slide In - Black & Gray - Thick Wall - 1000'/Bx [Keystone 313327]
36ft $55.40
Subtotal: $178.52 Shipping & Handling: $36.91