From R12's blue clarification box,
Quote:
Please note that this means that FABRICATED ITEMS from ROBOTS entered in previous FIRST competitions may not be used on ROBOTS in
the 2015 FRC (other than those allowed per R12-C). Before the formal start of the FRC Build Season, Teams are encouraged to think as much
as they please about their ROBOTS. They may develop prototypes, create proof-of-concept models, and conduct design exercises. Teams
may gather all the raw stock materials and COTS COMPONENTS they want.
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All we have to go on is that you can't use old robot parts. If you want to go with the interpretation that your bumpers weren't part of the robot to save a few dollars because you've got financial issues, I don't think anyone would take issue so long as you don't go parading the fact around. The spirit of the rule is more that you shouldn't be using mechanisms, drivetrains, and the like from previous robots.
Personally, I think you're in a grey enough area to be safe; but if you ask for official clarification, it's my belief that you'd get an answer contrary to the one you're looking for.