I have the Herb Adams kit and the front has the solid links and the rear had rubber bushings.
Note the front bar was made different than any stock bar and had vertical holes to facilitate a solid link.
Now you can go to a solid line on a stock bar but it would take some fabrication. As for the Addco I am not sure how the ends of the bar are.
The Herb Adams bar was made much like bars on race cars are as it would never work with a conventional pin like bushing set.
The Heim Joints as they are called are easy to find and use but the bar unless made for them will need to see some work as well as the control arm where it mounts. Many places that sell real racing parts will have these parts to adapt. They come in many sizes and you just need to work out what size you want to use. Summit Racing, Pegasus Auto Racing Supply, Howe Racing or Port City Racing should offer the parts to adapt the joints to the bar and car.
You will need the part between the hole in the bar and joint hole and the Joint hole and the control arm.
Also please note you need to have the car under weight when you mount the bar. You do not want to preload the links while it is sitting on level ground. If needed find something safe to put under the tires or control arms to leave the load of the car on the springs. Preload can make for some funky handling. It may have more load one direction than the other if you do it wrong and will handle better one direction than the other.
The original kits were one of the best available as it was developed for show room stock and also included solid control arm bushing to eliminate the bump steer. It was not cheap back in the day and few people bought them. I have only seen a couple. I bought mine new in 1986 and I bought some spare parts but I have not seen anything for sale for years. The rear bar is 1 1/4 and the front was 1 inch for a very neutral car. It handles much like an 88 but with only heavier steering as the geometry that lightens that up is all 1988 and not much you can do to lighten the early cars steering weight up other than take the damper off but then you get some kick back in the wheel.
[This message has been edited by hyperv6 (edited 07-30-2015).]