My 34 aft cabin 1987 marine trader had the aft head latch fail in locked position.
I disassembled web searched a stamped part # and came back with a perko part number, my local chandler ( Hamilton Marine) actually had it in stock.
I found several suppliers of lever sliding door motrice locks in the UK. The Union 2477 is too big for my door. Available in brass or satin chrome. Priced about Lb25. Find them at: MB Lock & Security Supplies Ltd.; Leeds, or Barnsley Lock & Safe; So. Yorkshire.