Debbie, that's the one I have. I also have the same model Viking. I Love the winder. The bobbins come out smoothly and evenly wound. I'm getting pretty good at estimating the number I will use for a project. I wind them all at the start and have them at the ready.
I got my bobbins here:
http://www.ebay.com/itm/100-Pcs-M-SI...aac8c#ht_0wt_0
There have been one or two bobbins from the batch of 100 that didn't seem to be balanced, so I discarded them, but you can't beat the price. I also like the ones with the hole so you can more easily start the winding process. the same ebay store also carries the ones without the winding hole if you prefer.