Sorry this isn't answering your question and is more along the lines of unsolicited input, but you might want to reach out to rigger with a good reputation in your area. They might have access to the information you are seeking and provide input on what you have an what might need to be replaced. Depending on your plans for usage, and of course the condition of the rig, an all at once replacement isn't necessarily required. You could do it over a few years. Of course if you feel like you need to replace the mast
, well then it is all at once.