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sacredhart
I'd assemble the bb on the spindle and see what kinda width you get to. I thought GXP didn't need spacers but maybe I'm thinking of the road/track version as it was with Omnoms that I used it so maybe the mtb version needs spacers as per Shimano.
The larger bit is the self extracting cap, screws into the arm after the crank bolt and the crank bolt pushes against it to remove the crank when you undo the bolt.