1998 dodge stratus factory stereo

Recently purchased a used 1998 Dodge Stratus for my daughter to drive when she starts college this coming fall.  Problem is it does not have a stereo installed.

The original bay is there and from what I can tell the original hookups are intact.  I purchased a used factory stereo from a local junkyard with all original connection in the back complete.

The problem I am running into is I don't see a ground wire for the thing on either end, that is car or stereo end.  My question is, does this factory stereo need a physical ground wire or does it ground when I mount it into place with the bolts?

The car has 2 plugs, one black and one gray, each with about 6 wires, and it appears to match your wiring diagram on this site.

I note that you list the ground as N/A so thus my reason for checking before I fry something.

https://www.the12volt.com/installbay/stereodetail/91.html

Any help would be greatly appreciated.

Thanks

Thanks for all the feedback guys, the car had the bolt strap that I plugged into the back of the factory stereo and everything seems to be working fine.

Again, Thanks for all the help :)