IIRC, Omega machines are the same as Euro Pro machines. if your zig zag is no wider than 5mm, this walking foot should work fine:
http://shop.sew-classic.com/Low-Shan...m-SCF10449.htm
I've been using the walking feet that Sew Classic sells on several of my machines, vintage and newer, for a couple years without any issues.
Cari