<HTML>At our shop we buy direct from Hastings piston rings and I believe they are the worlds largest supplier of rings. We can order a 1 cylinder custom set and the turn around time is only one day longer than ordering a stock set. If it involves sealing cylinders, Hastings has built it. A lady named Dawn in customer service can help with all your needs at 616-945-2491 or you might try looking at [
www.hastingsmfg.com]
Rolly is correct in the use of centrifugally cast iron for rings (where temperatures allow) and the best source is to buy cast engine cylinder sleeves of the right size and cut rings from it. There is no finer grained, high density iron that I have found to work with than this material and the sizes available are almost unlimited.
Peter Heid</HTML>