Contract on Camano Troll 31

New member to the group and first trawler (have a sailboat). Put in a contract on 1997 Camano Troll 31. Boat survey, engine survey, and oil analysis to be scheduled. Noticed in looking at interior that one of the horizontal sliding windows has a missing closing latch. Are there replacement latches or alternative latches? Also some of the plastic dome covers on the interior lights are brittle and broken. Are there replacement domes or suggestions for replacing the fixture. I am sure I will have more questions after the surveys. Input greatly appreciated.

Sometimes cheaper/easier/better to replace old lights with new LED fixtures.

Cannot help you on the window issue but fortunately even on my 1976 Hatteras the old parts are usually available or something else can be retrofitted.