Escalade Sports handles Indian Archery now, but they only do institutional and youth bows these days. I don' t think you' ll find anything on their site that will help you much, but the addy is:

www.escaladesports.com

You should take the bow to your nearest pro shop (hopefully a shop that knows a little something about trad bows) and try a few different strings on it. Should be a 60" AMO string, but it' s always best to fit the string to the bow.