An interesting question. My first instinct was "yep", they're seperate configurations and need to be included in overall weight... but the "replacement parts" argument was interesting.
If you look at the definition of a replacement part, however:
Quote:
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REPLACEMENT PARTS – A COMPONENT or MECHANISM constructed as a functional duplicate of an existing part of the ROBOT, for the purpose of replacing a broken or defective part.
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and specifically the section I have placed in bold, I don't think that swapping out perfectly functional bumper mounts is within the intent of the definition of a replacement part. You could ask the Q&A forum, but in this case, I think the rules are pretty clear.
Your bumper mounts are only a replacement part if you use them after the original bumper mounts fail, not if you use them as a matter of convenience.
Jason