QA1 LCA has no bumper

I bought an unfinished 67 Dart project car from a guy that had purchased but not yet installed QA1 upper and lower control arms. I was looking at the lower control arms tonight and there is no provision for a rubber bumper. That seems strange. Without one I would expect a nasty "bang" when hitting a pothole or something.

I noticed on the "Full Suspension upgrade of 67 Dart" post by Craig67 that his pics showed the LCA with a rubber cap-like bumper. But, the QA1 Website still shows it with no bumper.

Has anyone running the QA1 LCA without a bumper noticed any issues?

I suppose I could try and fabricate one just to be safe. But perhaps it's not really a problem.