I believe the #4 will fit. The agility and people 50 will interchange so it should fit the s9. I have not seen an s9 up close,but we think it's the same motor as the people AC.
Do they give any more info on the veriaters. Taller driveface or changed ramp angle. I have not seen these before. I like there other stuff!
I have been running the malossi and an after market drive face,this look's to be a new possibilty if you can get the whole set mached in one shot.
Your next step would be the contra probably mallosi green or something = .