I'm pretty sure the 8.8's are all the same going back several years, but not 100% positive. I know they do fit my 2010, 'cause I put one on there.
If you don't mind sourcing your own bolts, you can get a super deal on that diff cover at Levittown Ford Super Center, look them up on line . . . pretty sure they call it "axle cover" for Boss or GT500
EDIT: I just checked your link, and surprised to see that TASCA has a good price on it too! I gotta remember that, since they are practically local to me.
If you don't mind sourcing your own bolts, you can get a super deal on that diff cover at Levittown Ford Super Center, look them up on line . . . pretty sure they call it "axle cover" for Boss or GT500
EDIT: I just checked your link, and surprised to see that TASCA has a good price on it too! I gotta remember that, since they are practically local to me.