Those are the "old school" dual shock mounts...not recommended. Nothing against Toms or any of the other vendors who carry them (which is just about all of them). They really arent necessary. The old school duals --front and rear-- will 'handle' well, but they ride very harsh and end up being very jarring. In the rear, the old school mounts have some minor axle wrap prevention to them, but the ride is just not very good...but it will corner solidly...which was kind of cool.
More recommended, if you want duals are the tube style, which allow longer shocks and puts both the shocks to the rear of the axle. The cheaper, and better, way to go are to install the "F-150" mounts, which entails cutting off the stock shock mount and replacing it with a taller, and beefier, version of itself. I believe these are also sold by just about all of the vendors...or can be picked up at the local Ford dealer. You might do a search on F-150 mounts.
These mounts allow you to run a longer shock and different style...so you can run some Bilstein 5150 or 5125s with them...for a sweet ride. Stay away from Rancho, IMO.
Good luck!
