You will almost certainly have to fill in holes and redrill for almost any lever. And you will have to refinish or accept seeing the old filled holes. Either also means restringing.

Your best option is to order a sample Truitt and/or Forte and see how they will fit on your harp. Lever mountings also require varying amounts of open neck width. So order a sample and see how it fits up and down the string band. The fret point for the new lever will be _approximately_ the same as your current levers.

Also suggest adding up what this will cost just in parts. And if you’re not totally confident in your ability and skills for the tasks required, consider what it might cost to have a professional take over the project if you get stuck.

A good plan might be to start with a scrap piece of finished wood, drill and mount a lever or two on it, then remove, fill the holes and remount. And understand that you will be working to very tight tolerance or it will look very crooked.

I have never heard that Salvi levers have any tendency to snap or break. This harp was probably knocked over, or otherwise mistreated, to break and bend those levers. If you can get levers like the originals, and if you like their tone and throw, it would certainly be easier to just replace the damaged ones. Good luck with refinishing and refurbishing this harp. By the way, if I were replaceing ALL the levers, I would use Camac (French) levers, and they have a “gold” colored option. My Dusty Strings FH36S has a full set of Camac levers, and they are great!