There is a guy near me that does the original style seats. Last I knew, he was charging around $50. They are all stitched and very nicely done out of good material for boat seats. You can supply your Own foam or buy some from him.
Oh, sorry. I will Pm you and you can reply. There will be a small red number in the upper right hand corner of the screen next to your user name. Follow that drop down and click on the words 'seat cover info'