They redesigned version of the QA1 LCA’s have a bumpstop built in. The first generation of them did not (mine don’t). It’s good that they have a bumpstop, but, it got rid of one of the biggest benefits of the tubular LCA’s which is that they give back about 1” of suspension travel. Which is very nice for lowered cars. The QA1 update basically returned the travel to stock because the bump stop and mount they use is so tall. I think it could be modified though. I put my bumpstops onto the frame horn for the original bump stop.
You’ll still need an upper bumpstop for the SPC arms. You can use the stop bumpstop, but you may need to drill a new hole in the frame extension so hit contacts the arm.
