The all new Prime accessory kit fits all Prime models with the appropriate parts. Prime models prior to 2015 don not have the Ghost Grip aplates or Flexis Damper.
STX and MX 39 and 36 models do not have Ghost Grip plates.
Be sure to have Urban Archery install your accessory parts as you will require a bow press to install.
1 x Flexis AR Damper
2 x Ghost Grip plates (1 set)
1 x String Supressor
2 x String Splitters