I'm looking on the Bocas website and they have the 11.5x21x5 bearing but it's listed for the RS. Is this the one I need for the NS series? I know it's the right size but it has double rubber seals and the stock bearing has an open cage for the rear bearing. I'm ready to order this now. Here is what I"m looking at.

http://www.bocabearings.com/main1.as....5C-2RU*TH9/C3