I don't think you will find a bronze one. I looked a couple, few, years ago and the best I could find was 85-5-5-5 red brass which is close to bronze but not quite. This stuff actually would have been quite good but I think it was available only in larger sizes like 3/4 and up.
Doesn't PSS recommend a plastic, nylon, fitting to avoid electrolysis problems which is likely what caused your failure. A real MARELON fitting which is fiberglass reinforced nylon is strong and tough.