I don't understand what part you are referring to.
The major components are the seat, the seat swivel/slide, the pedestal post , and the pedestal base. On many Gradys the pedestal and base are one part.
I don't understand what part you are referring to.
The major components are the seat, the seat swivel/slide, the pedestal post , and the pedestal base. On many Gradys the pedestal and base are one part.
I removed the original brackets. I had to leave the passenger side bracket under the seat base....couldn't get it out through the access hole and didn't want to cut a larger one.
Then covered the holes with a piece of marine grade 3/4 ply.....sealed all around with 5200 and screwed down. Then through bolted the new seat bases.
I would replace the pedestal and base but you will need to check if you have enough space to mount a round base. I can't tell from the pictures. If not you will need to get a 'flat' sided base that has one flat edge so that it can be mounted towards the edge of the seat locker.
Here is an example