Fuel pump spring

Hi, I have a 2001 Hayabusa with the external fuel pump and I recently noticed that when I stripped it to clean it that the spring thats on the filter was into the housing first then followed by thefilter then the plastic carrier. It wont fit any other way and yet all the diagrams I have seen for this show the spring as going in after the filter and then the plastic carrier ! I wonder if anyone knows how many variations of this set up there are. Also my bike seems to have attributes from the 2000 model such as this external pump and higher number speedo..When in 2000/2001 did they actually make the change to restricted as my bike seems to check out as standard and yet is a 2001 model. Thanks for any help anyone can give me on this All the best Wackyman.

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