QA1 LCA has no bumper

Yup, this is what I use

https://m.summitracing.com/parts/ens-9-9136g

Works pretty well, good height too. I actually run an 1/8" spacer under mine, but, I sit pretty low and run 1.12" bars. I still have almost 6" of travel at the wheel from bumpstop to bumpstop, it's just the travel is recentered around a lower ride height.
Thanks! I just ordered 1.12 bars. I went back and forth on 1.06 vs 1.12 and decided to just go for it. I'll be running them with the Hotchkis adjustable shocks. I'm shooting for a ride height similar to Peter Bergman.