Looked my arms at the desk.
I've got 10pairs of arms.
2pairs are there from the ZX-5.
4pairs are the KYOUM521.
4pairs are the KYOLA255.
So win-win for me.
And i finally realized that my car has KYOUM521 rear arms and hopefully the KYOUM519 rear axles. Oh, what a good day.
EDIT: Can i use the KYOUM519-2 with KYOUM521 or i have to use KYOUM519?