rubber

i am ready to pull my hair out!!!!??? does anyone know where i can get replacement seals for my canvas? i have been looking for weeks and nothing i have come across is an exact match... Ameritex Fabric Systems Sure Seal was what i was hoping to grab (still don't think they will fit right) but...

so I am also wandering if this old 1968 srv 185 has the rubber impellors and boats do. I am afraid to take apart and look at stuff without knowing parts numbers. My original manual doesn't say anything about them or have them listed in parts list. I think I know where they should be on new...