I'll tell you what I can since you didn't get any other responses yet, but you should confirm with a rigger before you commit any money.
I believe the forestay, backstay and both uppers are 1/4". The lowers are a size smaller. Best guess is 5/32", but I don't have access to the boat right now to confirm.
I do not know the lengths.
Not much of an answer, but it's a start.