You do know that the Xclamps etc are clearly stamped with the manufacture dates. Along with Serial number to match motherboard. Microsft never used to check all these things but since they started recieving boxes that people tried to repair and stuck back togeher they are doing this.
The Motherboard, Chassis and Xclamps, and case all need to match. I used to keep all my xclamps for this reason.
You could try fooling them as i have tried in the past but they thoroughly check them now. All you will end up with is ?40 quid out your pocket for postage.
I have a bundle of xclamps. You can have them for price of postage.
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