why not check Viking's web site out. I do know there are different FMQ feet, open toed, closed, clear. So it could be the right foot but just a different kind. I'd go to Vikings website and find the manual on accessories and see what the numbers are. All of my viking feet have a number engraved on them. Its probably easier to google your machine name and include either accessories or manual in the search. When you see Vikings website click on that one and it'll take you to your machine. Some of thier machines are archived so you don't see them as easily as other but they are there.
Here you go, looked it up for you
This is for your machine;
http://new.husqvarnaviking.com/en-US...s/SAPPHIRE-835
This is for the extras, you might have to click on show more at bottom of page to see all the extra feet.
http://new.husqvarnaviking.com/accessories#1212