Installing Xeon CPUs - heat sink problem

I have an Intel server board (S5000XVN) and 2 Xeon 5300 series CPUs.  I've mounted the CPU's ok but the heat sink I don't get.

On the bottom of the motherboard there's 2 metal plates the heat sinks are supposed to fit into.  They do fit, the holes match up and the screws in the heat sink poke through the other side but that's my problem.  Both the CPU instructions and motherboard setup say to set these heat sinks in place and screw them into the plate under the motherboard but the screws are smaller than the holes.  They dont' screw into anything, just poke through the holes in the plates.

No nuts or any other hardware was supplied with the motherboard or CPU (the contents listings indicate no other parts).  These are both Intel products designed to work together so why doesn't the heat sink actually screw into the brackets under the motherboard or... what do I do?

Thanks
Meshman333Asked:
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Handy HolderConnect With a Mentor Saggar maker's bottom knockerCommented:
Does it look like this at the bottom?
http://prohardver.hu/dl/cnt/2007-10/1776/picz/bott.jpg
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moon_blue69Connect With a Mentor Commented:
Is it supposed to screwdown to motherboard standoff screws??
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RushBConnect With a Mentor Commented:
http://download.intel.com/support/motherboards/server/s5000xvn/sb/d36221004_s5000xvn_qsug_backoutline.pdf

There was not a small metal plate included that sits under the motherboard?

Thanks,
RushB
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Meshman333Author Commented:
"There was not a small metal plate included that sits under the motherboard?

Yes, there's one under each CPU location.

"Does it look like this at the bottom?"

Actually, no, it doesn't.  It has the two metal plates underneath but not the larger plate shown that's on top.

So I checked around.  The plate in the pic didn't come with the motherboard or the CPU but two of them came with the AIC rack case I'm mounting it in.  Very weird because if I wasn't mounting this in a full rack case I'd be screwed.  Problem solved anyways.  Thanks!
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