Robin March

Hello, Some hand trimmers are available with the ability to be converted to a plunge router (Von Haus, Bosch and Makita). I have the Ryobi 18volt +1 system and am disappointed to see that the 18Volt battery trimmer doesn't have a plunge accessory available. Does anyone know if the plunge kits from the other brands would fit the Ryobi as certainly they look about the same size? Thanks