[SCOTI]

It's common for some possible trimming on the lower a-arm 'gutters' when using drop spindles. Usually, a minor buzz w/a 60grit flap disc on an angle grinder will get the job done. You want to make sure there's enough gap so the wheel lip & wheel weights clear w/o issue. If you need to do this, just don't cut it w/a sharp/90° cut. Buzz away w/the flap disc as needed keeping the edges broad vs. sharp.

It's a toss of the coin if it needs to be done when using stock wheels & more common w/aftermarket wheels have increased back-spacing.