Well I was told the old arms were stiff and hard that is why they were easier to break, also in cold whether. If that was true.... I do not know. Now I heard the good arms are very flexible which the ones on this truggy are and the new arms I have in stock are flexible too so who knows. BTW Pooldoc the front diff outdrives on my truggy are grey and do not say OCM and the rear diff outdrives say OCM on them.