CAPTAIN CHAIR EXTENTION POST DIAMETER SIZE

[newtoboat101]

please take a look at pictures ,need to get seat post extention ,but boat is 200 miles away ,what size diameter do i need thank you ,looks like an older attwood seat , but not sure

 

[Bondo]

Ayuh,..... There's way to many to guess,.... it has to be measured,....

 

[newtoboat101]

dang it ,thats not the answer i was lookin for ,but do appreciate