Thanks for posting up the detailed rite up on the install! Lots of great close up photos and good tips.
The reason we do not have a hole in the forward lower plate where the small KDSS skid plate goes, is because we have actually not even had a KDSS equipped 4runner available to bring in our shop and do an install. We used the same lower mounting plates as we do on the non-KDSS sliders. So we do not have a measurement to work from as to where we could put a hole for the tab.

The easiest way to address this is to just lay the KDSS skidplate on a table or cinder block in your case would work well, and flatten the tab with a hammer. That way the tab doesn't need to go back into a hole, and you don't have to bust out the hack saw or grinder to remove the tab.

Do you mind if we post a link to this thread in our vendor sub forum for others to see?