how old is your 190 complete interior seat are stocked for 5 years (including 08) and skins for around ten (or untill they are sold out) Only available from MasterCraft dealers, and you'll need a picture of the original to place the order. Logos are hit and miss for non current styles. A good vinyle shop can recover seats with MC skins or new material (i worked parts }at a dealer for a while)
you can call around but i'd bet you wont find original vinyl for a 93' 190. Go to a someone that does interiors for cars and boats and they can make you what you need. It will probaly cost less then factory parts too. I good marine hardware store will stock most handles and hinges you might need.