The 201 takes a 66 class bobbin, definitely not the 221 bobbins.
Mar, there are a couple of possibilities here:
1. You received a faulty bobbin from Sewing Parts Online.
2. It's possible that your husband may have mis-researched and your machine may not be a 201 at all.
If it's #1, I'd recommend ordering class 66 bobbins from a trusted source like Jenny at Sew-Classic, whom I believe tests the bobbins after receiving them from the wholesaler.
#2 is more common than you'd think. Sometimes people read the serial number wrong, or read it off of the motor plate rather than the badge on the bed, or find a manual with the machine that is actually a manual for a different machine. I've seen all three things happen. The most sure-fire way to determine what model you have is to post a picture of the machine here, and one of the serial number plate, so you've got multiple eyeballs on it.
hope that helps,