The knuckles/hubs sold on Rockauto are REAR knuckles for Cobra IRS equipped cars. They won't apply to your V6
The
front steering knuckles (spindles) aren't sold as a replacement. Generally these are not replaced unless physically damaged. They are only available used. It's a bit of a PITA to dig them out of the suspension for some paint, so generally not done unless you have another reason to take apart the front suspension. The used spindles can be a little pricey because Foxbody guys scoop them up to put SN95 brakes on those cars.
On Rockauto, the Motorcraft hubs (P/N HUB10) are $70 each. I put a set of SKF (P/N BR930250) on my Foxbody (with SN95 spindles) that typically run about $40-50. The nuts are one-time use only according to Ford, and the original caged nut design has been superceeded. Dorman makes a cheap replacement nut, but I would go for the Motorcraft nut (P/N W710084-S439) in this case.
Generally it's a pretty easy job if you have the correct tools. These nuts are on there pretty tight. The OE caged nuts use a 36mm socket to come off. Have a breaker bar and cheater price, but my electric impact was able to zip it off fairly easily.
The hubs just slide off at that point by hand.
Installation is easy. Slide on new one, torque the nut to 220-295 ft-lbs. Reinstall end cap.
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