Hayyyy there young. Happy Saturday.
They do make one for the 65-66 F-100F-250 series for the Front and another co makes them for the rear. Might take a little time trying to find the info. You might be faster finding yourself on line, but I will look around.
I have personally install 5-6 ofthe fronts and 3 of the rears.
The front ones install to the forward of the cross support so it stays away from the linkage.
The rear one installs to the rear of the drive housing
The front one is, if I remember correctly, 1 1/8" and the rear 1".
However, I do believe that the ones off some of the 67-76 F-150s or F-250s, will also fit. Sorry, just can't recall which years. I know it has been talked about on this site so you might do a search.
I'm pretty sure Bill (ND) posted something on that thread.
I DO KNOW that they take most sway out of of these old trucks.

 

73-79 dentsides had both the I beam sway bar and a radius arm sway bar as an option. All the parts that came with my truck included the front suspension from a 1976 F150. Sorry I do not have pics of it. I did this conversion on a 66 truck in the 90's. The I beam one is difficult due to having to mount brackets where the I beam/radius arm connect at the spring. There is a round plate in the spring that has a nut on it that holds the bottom of the spring. You have to remove this nut with a wrench and lift up the plate to discover a second nut. Poopie work! For an added bonus the 78-79 Bronco rear sway bar is also a bolt on for the back and it really tightens things up.

 

 

Here is a page I downloaded from an old thread. You will need the radius arms and brackets from a truck that had a sway bar. My truck came with 79 front suspension and brakes so I already had the radius arms. It took me awhile to find the brackets and sway bar but I finally found an F350 and mined the parts out of it. The only new parts I could find were the links and the rubber bushings. But be ready to mine all that stuff out yourself because I couldn't find a junkyard that was willing to do all that dissembley to get to those brackets.

 

 

 

 

Thanks Bill! Do you have page which shows the 5C499 bracket? maybe I could find a pair.

Do plan on building my own front bar setup but those pieces I could use.

 

Do you have any photo's of front or rear?

 

2) D5TZ-5C499-A .. Front Stabilizer Bar Mounting Bracket - Right/Left is the same / Obsolete

1975/79 F100/350 2WD // 1975/91 E100/350.

Here's the pic of 1980/89 E100/350 showing the 5C499 bracket (click on pic twice to enlarge it):

 

 

Are my eyes playing tricks on me or does that truck have more leaves in the right spring than in the left?

 

Tricks! They are the same I pulled 2 leaves out of each side to lower the rear slightly. I still have them if it doesn't work out. I got off my **** and took some more pics.