Ray, the square part that resembles the FK/FF type on a BF/BF is just the bearing retainer plate - the bearings are mounted in a bore in the main body of the block.
Keep an eye on the quality if you're going for the cheapies - mostly they're ok, but some aren't. Fortunately, most sellers of the cheap ones are pretty good about replacing faulty products. I stick with NSK's WBK series now, but they might not offer the best price/performance balance for your project.
Best regards,
Jason
Last edited by Jason3; 10-30-2009 at 06:40 PM.
Reason: Add pic of cross section...
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