The R9s is just a 35plus21 on JP spec. Why searching for a hard to find P/S set while you can find a compleete 35plus21 for just 200 euro?

Or a new type JP 9 port:
JP .21 Novarossi Tuned Engine V2 1/8 On road - NTech RC
The introduction price was 279 euro. 2 months ago they were offered me for 250.