Getting tired of either sitting or standing on the bow of the boat.  I want to lean.  

BPS has two lengths on their pedestals.  I measured from the bottom of my butt to the floor and it is right at 31".  Longest pedestal mount that BPS has is 29.5".  I assume that would be enough height since I'm only 5'9 and there are plenty of people out there who are taller than me and they don't seem to have any trouble finding a pedestal mount.

So am I correct in assuming this?

Get a Swivel-eze or Springfield adjustable.

get an adjustable one.

Adjustable for sure.

Add to the 29.5" pedestal the height of a butt seat and you should be in the ball park

Add to the 29.5" pedestal the height of a butt seat and you should be in the ball park

AGREE!!! Plus get an adjustable

This is the one I am going to get.

http://www.basspro.com/servlet/catalog.TextId?hvarTextId=915&hvarDept=200&hvarEvent=&hvarClassCode=4&hvarSubCode=9&hvarTarget=browse

With this seat.

http://www.basspro.com/servlet/catalog.TextId?hvarTextId=90529&hvarDept=200&hvarEvent=&hvarClassCode=4&hvarSubCode=8&hvarTarget=browse

When I made all the mods to my jon, I got almost everything at BPS. They had 2 adjustable pedestals with the 3/4" pin that had notches, and 2 with some hydraulic doodad.  Actually, I guess there were 8, because the pins came with and without threads.  Look for the Kingpin brand.  

BTW, you may only have a 29 max height, but you add the mount and seat to that and it'll get you close to your 31" butt.