Recently purchased a 1996 240sx and one of the two license plate clip on nut holders was broken. Looked around and didn't find anything so whipped this up in about 15 minutes in Fusion 360. Met my needs and liked it so much I printed two so they matched. Currently is using the 2 M6 Nuts from the original clips just pushed into the recess.
Turn 90 Degrees and it's side and print with minimal supports.