My street used Tubular K frame is getting close!

the upper and lower poly-bushed ends used are street rod pieces....Speedway Automotive

the upper pivot piece...is a mono ball ...used in place of a balljoint.
it's a dirt track suspension piece that has been around for years...I use it to elevate the upper pivot point for accurate geomerty and to adjust roll center....remove the bolt and you can add or subtract spacers moving the mono ball (pivot point) up or down.

A mono ball is also used in lieu of the lower balljoint for the Art Morrison strut/superstrut

because it is slighly smaller....it also allows more room for the coilover spring