There are a bunch of iterations of these around now.
Driftmotion has a set, BIC has a set, Arizona I believe had a set.
I originally remember this style endlink being developed by drjones back in the day.
The BIC ones look the most like the original style that Adam developed a long time ago.
Basically its just a bunch of mcmaster parts that are put together.
The ones you have pictured here are basically small balljoints like an outer tie rod uses.
The good part is the joint has a rubber boot, but no idea on the quality of the parts.....
I got the ST's installed and I am happy with these. I don't like that they are heavier than the stock sway bars but ST bars are solid not hollow. I really like how the Supra handles now but I also have TEIN coilovers, adjustable swaybar end links, battle version rear arms and some other newer suspension parts.
This is the site I bought mine from and it was the best price around I found at $245 for the front and rear set with hardware plus shipping costs: