I have the same machine and it takes the Husqvarna Viking Mega Foot. Got it at Sewingmachinesplus.com
Description: Walking Foot XA7253001 for High Shank Straight Stitch Machines. You must have the sewing machine settings at: Thread tension 4-5, Stitch length 2-4, Foot pressure 3-5. Speed control slide to the left position. Sew Slow.