That is exactly the website I used. I used swedged tubes which added to my total cost. Since you can weld you could just use some steel tubing with nuts welded on with heim joints and grade 8 fasteners. I just used some plate steel to make the front brackets with multiple adjustment holes. I cut an old pair of slapper bars for the part where the bottom of the heim attaches to the spring bracket. The actual Cal tracs I believe use a pressed pin for the part that pushes against the spring. I just used a piece of threaded rod which ended up bending before I reinforced it with a slightly bigger OD piece of steel tube. It has worked well. I dead hooked with street radials at the drags and shattered my 8inch so now I have a 9inch. Good luck!
It sucks to get old but at least the expectations are lower. 65 mustang coupe, 306, 10.4 compression, 180cc homeported Chinese heads, funnel web, t5z, 4.56 gears in a 9 inch locker