HDK suspension

Would you be able to run qa1 lower control arms with this setup or is it required to use hdk lower control arms

You could run the Qa1 LCAs if you added something to secure the rear of the LCA once the torsion bar is removed.....and move the shock mount outward.....and maybe do something with the no longer needed torsion bar hardware on the LCA, . Of course, you could run a factory LCA if you did those mods.