Rail Block fitting question?

Gene Sung

Veteran
I have small gini rig base plate with Rods and a follow focus. This one (link):

http://www.ebay.com/itm/Follow-Focu...aultDomain_0&hash=item3cc57103ca#ht_522wt_818

I need a rail block for the other end of the rods. Probably something like this

http://jag35.com/products/rodclamps/railblock.html

My question is, do rail blocks have a pretty standard fit regardless of manufacturer? Will this work with pretty much any baseplate / rod system?

I am assuming it will work because looking at the Jag35 rail block (as well as other companies blocks), there is no horizontal adjustment, so I'm assuming there is a standard fitting for all systems regardless of manufacturer. Is this correct?
 
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