"Replace with genuine Ford parts."

If you think this means it must be a Ford part then we don't have much to discuss. You didn't reveal the size of the HDD and more importantly you didn't tell if you had the restore media ready.

So let's get a HDD up on the table for discussion. Remember these are fungible.

http://www.amazon.com/Best-Sellers-Electronics-Internal-Hard-Drives/zgbs/electronics/1254762011/ref=zg_bs_nav_e_3_193870011 is the best sellers list.

How about this one?
http://www.amazon.com/Blue-500-Mobile-Hard-Drive/dp/B0037NYQ6Q/

And if you want a small bump in speed without worry try this one.
http://www.amazon.com/Scorpio-Black-Cache-Mobile-WD5000BPKT/dp/B004LR1RPK/

Bob