Call Shimano's customer service number and they should be able to help you out. Ask for Robert he's helped me out in the past and is a really nice guy.
A-RBs will run about $20 to replace both spool bearings in your Calcutta. I have had them in my Scorpion 1500SF, Curado 100, and Citica 200 for well over a year now. These reels are fished almost daily, light inshore work (saltwater only), and in addition to improved casting distance over the stock SS shielded bearings, the A-RBs have held up very well corrosion-wise.
To JP and others, I have plenty of new stock BBs (& new ceramics) that I'd gladly trade for A-RBs ... }(
bunch of places on the net have em, i happened to get a 4-pack of ABEC5 (or ABEC3?) ceramic hybrids from bocabearings.com. TG ceramics go for twice as much but are rated ABEC7. cabela's sells em too, not sure what brand/rating though ...
found a place in Irvine. VXB bearings http://www.vxb.com awesome prices and they sell on ebay. But I'm sure how to clean the grease out and replace it with rocketfuel or reel-x.