QA1 LCA has no bumper

Thanks for the detailed pic.
I contacted their Tech Line today. The guy mentioned that adding the bumper was a "running change" that occurred about a year or so ago.
I asked if they provided a retrofit kit so someone could add the bumper. The answer was no. They'll sell you the rubber bumper itself, P/N 9047-1116.

Maybe I'll consider fabricating a bumper stop. Maybe not. I suspect it's not a big problem as I searched and didn't see anyone complaining about metal to metal contact. Perhaps the LCA doesn't travel enough to actually hit the frame rail. Something else might get in the way before that point.