www.signaturelm.com
highlight parts
click "parts counter express"
click "search by part number"
Enter in the part number.
Part #: YS2Z-5410176-SSPTM (Right)
F8RZ-5410177-SSB (Left)
Or just give the part # to any ford dealer and they should be able to help you.
I also have no idea why the left is over $100 more than the right.