how can i pass dynamic block device/partition info from %pre to part --onpart=?

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I'm using rhel5.6 anaconda, and attempting to align some systems with SSD disks with parted, prior to kickstarting them.  My kickstart contains the following:

%include /tmp/pre_install_parted

%pre
# use fdisk -l to determine if the block device is /dev/sda or /dev/hda etc...
echo "parted -s $(fdisk -l | awk '/Disk/ {print $2}'|cut -d: -f1) -- mklabel msdos mkpart primary 2048s 514047s mkpart primary 514048s -10M set 1 boot on" > /tmp/pre_install_parted

The above is nice because whether I'm kickstarting on /dev/hda, /dev/sda, etc, parted finds the block device and partitions the drive starting at the 2048 sector.

Now I'd like to somehow pass the block device info from %pre to the partitioning portion of kickstart:

part /boot --onpart=$(the output of the above fdisk command)1
part pv.0 --onpart=$(the output of the above fdisk command)2

Is it possible to do this?  Can I somehow read the contents of a file I create in %pre and use it as the argument to --onpart=?

Thank you.

Mark

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