Looking for help again. Norvise Auto Bobbin "O" ring......?

[Whitewolf]

While at Ace today I was looking for an O ring. Happened to just have the bobbin clutch assembly wit me...NOT why I was there looking for an O ring. But the danged sales rep saw it and said he could see many cracks in my bobbin clutch O ring. So he sold me what was supposed to be the replacement. The O ring from Norvise is awesome good. I kinda damaged it getting it off. And the replacement from Ace is not the right one.....

Can anyone tell me the part number of an O ring that will now fix my bobbin? ....and what store to get it from....like Lowes', Home Depot, Ace????? I hate to bother Norm about it. With his wife ill......

thanks in advance....
BTW the O ring the Ace man sold me that I went there for.....does not work either! A wasted 30 miles round trip......