The fasteners don't come with the seal that I bought from Detroit Muscle Technologies. I used the below rivets to attach the seal to the divider (seal on the wing window side). They worked well.
Hanson Rivet & Supply Co, phone # 800 777 4838
Part number C4-6-ST 5056-H32 Aluminum. Only need 4 rivets per door.
You can buy the install tool from them, too
Part number HT-174-WR
'68 D100