Joe,
I looked at the seat on my boat & all it has on it is Garelick Ezy-In but it's width is 25 inches (see photo) and that was the max width I wanted. My home receipt says it is a GAR 48252W with folding back, 25 in. wide, 21 in. deep and 19.5 in. high. I paid $186 for it from BoatFix.com. Seat fits my big frame very well and the butt cushioning is much better than the original.
The post is a SeaSuspension 1625 that was offered for $675 on this forum by SeaSuspension. The base holes lined up perfectly with the Parker holes so I used the same bolts. I think they are now painting it Parker color as mine is white. Love this shock absorber.
The footrest is the same one that Parker supplied which is a Springfield. Since the SeaSuspension post is larger in diameter than the original on my boat, all I had to do was order a different diameter plastic sleeve (see photo) from Springfield & it was inexpensive. The Springfield bushing (I think) is 2171040. The SeaSuspension engineer suggested I not stand directly on the footrest as it might affect the post but I cannot stand on it as I would crush my neck if I tried by hitting the ceiling.
I have a new Wise seat with arms on a Garelick shock absorber on a post I you PM you info on to see if you want it, if not I will post it for sale. Admiral changed her mind so I never installed it.....................................Pete