These files are applicable to my Native Watercraft Propel Slayer 10 kayak to raise its seat height by one and a half inches. This mod requires a change of hardware for the front mount which will now utilize a 1/4-20 x four inch long stainless steel bolt to replace the oem knob fastener and will need to be used with the new printed knobs. These risers may be applicable to other Native Watercraft but that is unknown to me at this time so investigate further prior to printing.
UPDATE 08/25/2018: I have added two additional files to my set of risers which will now increase your seat height to two inches. This two inch riser requires a change of hardware for the front mount which will now utilize a 1/4-20 x 4-1/2 inch long stainless steel bolt to replace the oem knob fastener and will still require my existing printed knobs.