The members have proposed lower cost alternatives to Grady all good, some very good deals on pairs as well, get seat and cushions only.
They fit same pedestal.
Grady had ladder backs optional on your boat when new, as mine.
As far as canvas goes, it is not actually canvas but totally synthetic. Depending on where you are, I would say a complete new set of canvas will cost about $2K. If you take care of it, it will last 5 - 10 yrs. Ask your local marina or Grady dealer, or neighbors in marina for recommendations, get a few quotes.
If your canvas and zippers are still good, you can save plenty by having only the clear windows replaced. They yellow, scratch, shrink, harden, and crack over time.
That's what I intend to do next, since I went fully new on canvas about 7 yrs ago. Especially the front windows since looking out those all the time.