Sorry about that! I grew up going to arcades through the 80's and love these games and was always thinking at some point I would build a nice game room of my own. Big Nintendo fan and loved this Arm Wrestling game at the one place I've ever seen it at the shore in NJ. I saw an Arm Wresting...
Found out this is pretty rare after doing some initial research.
I heard it doesn't come up that often so posting here in case anyone is interested.
Nintendo Arm Wrestling Arcade Conversion Kit - Unused in Original Box - Unique? | eBay
Let me know if you have any questions, thanks!