Hori Stick Question

Wanted to buy a HORI stick for PS4, but there are so many versions!

Can someone please explain the difference between these 3?

RAP 4 Kai: https://www.amazon.ca/HORI-Real-Arcade-Pro-PlayStation/dp/B00SULMRI4/ref=sr_1_1?ie=UTF8&qid=1441074048&sr=8-1&keywords=hori

RAP 5 Kai (Japan Only?): http://www.amazon.co.jp/【Amazon-co-jp限定】リアルアーケードPro-V改-Xbox-One-360-PC/dp/B01195GHM4/ref=sr_1_1?s=videogames&ie=UTF8&qid=1441073423&sr=1-1&keywords=リアルアーケード改

RAP 5 Hayabusa: http://www.amazon.ca/correspondence-Arcade-controller-Pro-V5-Hayabusa/dp/B00S94RODA/ref=sr_1_7?s=videogames&ie=UTF8&qid=1441074205&sr=1-7

Thanks in advance!