No clue where it goes.I do not believe it is for the soft top (I removed my hardtop and installed the soft top my self and did not see any piece like this). I know this is not for the hard top plug and wiper hose. Since this ends in RH, I believe it is for something on the passenger side (Right Hand side). I searched Google to see if it had to do with the seat belt, but no luck. It is probably for something underneath the passenger's seat. If you have a two door, I would narrow down to the front seat as I have not found anything like that on the back seat of the two door. My second guess would be something under the dash on the passenger side. Hope you find its home.
I've seen that and saved the pic, still not quite sure what it is or where it goes.