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I believe that you need a Torx T6 (not T8) to remove the 4 HDD stabilizer/spacer screws. I've got an entire set of Torx screwdrivers, so I don't remember exactly which one I used, but I'm pretty sure it was the T6 not the T8.
 
You might as well get a set of precision screwdrivers.. you'll need them eventually and this way you won't worry about not having the right tool.
 
This is a guide for the older plastic case Macbooks. If that is the machine you have, then you are right. For the unibody Al Macbooks, I believe you need a T6. The HD mounting on the machines is completely different.

Yeah I have the older plastic model. C2D 2,1 Macbook.
 
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