Supsters PE Paddle Blade for Kayak Option

Supsters PE Paddle Blade for Kayak Option with Glass PE and many more

This paddle blade is an ideal addition to many other divisible paddles.

Simply remove the grip part, insert the paddle blade, lock it and you can paddle with your sup paddle while sitting or kneeling. 
The insertion part of the paddle blade has an outer diameter of 26 mm. 

With this measure you should be able to determine whether it fits the existing paddle.
The shaft can even be ground thinner if the existing paddle has an inner diameter other than 26mm