Probably same as the smaller ones. I don't have a Kifaru pullout but I would assume they are #5 or maybe #8 zippers. If I recall correctly, zippers are measured by the width in millimeters. So, a #5 is 5mm wide. Check any of the online outlets or Amazon and you should be able to find some. I would suggest finding either a bulk deal on Amazon or buying it by the foot and then just adding pulls as necessary.
I just checked and I have a bunch of #5 that I think I got from DIYGearsupply.com. Also, remember that the smaller #3 will work just fine and reduce weight unless you have a heavier duty application.