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The thread pitch is the same front and back but the front ones are about 2mm longer overall, but you can use the front ones one the back (i did) and they will just stick out a bit more but once you put the rubber caps back on you wont notice. They seal on the end valves and not the thread anway.
I have a pic of the overall length below but I cant remember if this screw is from the front or back :S