Not positive, but the dark area on the cup in the drawing (farthest part of it to the right) looks like it is bigger in diameter than the rest of the cup. Looks like it should go toward the spring & retainer assembly. If your cup is larger on one side, I'd assemble it with the large diameter portion facing away from the piston.
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2003 FXD; 2004 Ultra; 2006 883L (The wife's. We were married Tuesday May 12, 2009) PGR # 892.
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