Well, the only one I found on different websites was labeled as rear. I'm not sure why they would label something at the front of the motor the rear.
Parts are generally labeled from the drivers seat as far as direction goes unless its engine, then its generally where it is from the front of the engine bay.
Hopefully someone with a little more GXP experience can step in and clarify it a little more, because as it is, it doesn't make a lot of sense to me.
Edit: They could be referring to this part as the front of the mount as a whole and the other portion as the rear, but that still doesn't explain your length issue...
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