Tubular UCA install questions

CRUZE 418 said

My upper tubular CA sure don't look like those, and I didn't have to grind anything.
Granted, this picture is of my Gerst suspension, on my '69, but my '72's stock front suspension has a tubular upper arm and looks the same.

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There’s a couple reasons for this. First, not all the UCA mounts look the same. Somewhere on here I posted a few different mounts, the tab that interferes is shaped different on all of them. The other reason is your UCA’s have the wide “U” shape, which locates the arm of the UCA differently.

Typically UCA’s with the tighter “V” shape cause more interference at the mount because of the angle the arms take leaving the mount. However, that angle also means they allow more tire clearance. The wider “U” shaped arms limit rim width and backspace some if you’re trying to max out wheel width up front.