Sending unit grounding point

[MisterC]

Hey all,

I'm trying to get my interior all planned out and finished. In the attached picture, (Thanks Farmer66) the back of the cab has a detent where the the sending unit ground wire goes. I've seen this before, but mine doesn't have that. Which way is most common and why the difference?

Mine simply screws the back of the cab. The problem I have is that the screw pushes against the back of the center section of my buddy seats and I'm afraid it will eventually tear the fabric. I'm thinking I should just drill a hole in the sheet metal under the window and tuck it back in there.

Any opinions are welcome!