This is partially Bimba and partially FIRST at fault. Fortunately, Bimba is stepping up, notifying teams, and offering free replacements. The issue is that the rules clearly state that the only cylinders you can use are the ones listed on the order form in the pneumatics manual, but apparently a lot of people didn't notice the discrepancies between that order form and the online form. There has been lots of discussion about this topic here:
http://www.chiefdelphi.com/forums/sh...ad.php?t=52472
I think there were some other threads too, but I can't find them offhand. I hope you are able to alter your design without too much hassle. Best of luck with the rest of build season.