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My 75 F100 4x4 has these shock mounts that I can't seem to find anywhere. One broke on me and I don't know where to look to get one to replace with. They look similar to this: Rear Shock Mount, 1967 - 77 Left
Again it does not have the separate tower where a studded shock mounts to, it has an eyelet setup like shown in the link.
Looks like your best bet is going to be salvage yard or a want to buy add. Ford didn't sell that bracket separately, it was only sold as part of the spring housing. The way its listed in the Ford parts catalog is "Housing assy., front spring and shock absorber".
Its also side specific
RH D6TZ-5A306-B
LH D6TZ-5A306-A
I did a search and couldn't find any dealers or obsolete suppliers that had any.