Where can I find a bearing retainer seal for 7 1/4 rear?

I did find one seal on ebay, but its on a bearing!.. Is it post to come new with the bearing?..if so the one I got from rock auto may be the wrong bearing!
The # I got off the seal are the same as the ebay one!
MRC RW6-11B
6411B
ABEC1
If the baring is the same may need this one, RW6-11B MRC Single Row Ball Bearing NOS