Gregg, according to my parts book the part number for the drive chain is 912493. The length for a CA is 97 links and for D14, D17, WD and WD-45 length is 104 links. I'm sorry the book does not have dimensions for the link size. I can measure when I am at the farm this coming weekend.
PS. The machine uses the same chain part number for the hopper drive at 26 links.