https://www.blowsion.com/blowsion-tilt-trim-system-yamaha
It sounds to me like a new system, emailed Scott and they can do any size reduction rings.
New for 2015 is the new Blowsion Anti Ventilation Tilt System. Designed, tested and developed with our pro riders for the last year. The result is the most advanced tilt system available. The main goal was a tilt system that had zero pump ventilation. You can turn the steering nozzle lock to lock with zero ventilation and maximum pump pressure. The result is faster aerial spins and better bottom end thrust. For 2015 we also beefed up and reinforced the entire system to withstand all the abuse todays top level athletes and big bore motors can dish out. The system includes the new roller bearing EZ Pull stainless cable assembly as well as interchangeable stainless compression nozzle rings for adjustable pump pressure and thrust depending on your motor and riding needs. (additional nozzle rings, compression and exit nozzle diameters available).
Designed for the Super Jet, Blaster, Polaris Octane, Rickter or other aftermarket hull purists wanting the extra edge for back flips, barrel rolls, 360s and more. This deluxe kit is install and ride -- no grinding or pump fit nightmares. Includes heavy-duty trim cable and all installation hardware. Fits all years Yamaha SJ Design, Blaster, Aftermarket Hulls and Polaris Octane. (Trim Lever not included in kit --
Blowsion Tilt/Trim levers in stock.) Compatible with the OEM pump or Skat-Trak and SOLAS Magnum Pumps. 30-35+degrees of tilt available depending on rear bond line modifications. 84/86mm bore size. Includes thru hull aluminum tube for cable routing. Kits are available for 144mm/148mm & 155mm/160mm Pumps.
Part Number:
02-02-504