Proper bearing size rm-324 deck

[Brit 9]

Looking for the bearing size for the rm-324 mower deck.   This is for the pulley that sits closest to the engine.   I found a drawing here on the forum, but its pieced together and im not sure its accurate.   If it is, then bearing B-128 will work.

 

Thanks!

 

[Tankman 3,518]

Not sure of the size. Is yours missing?

http://www.qbcbearings.com/BuyRFQ/SleeveB_StandardS_P_SB_I.php