I thought they were, but I just looked in the ‘65 parts book and don’t see it. So maybe not. But still a cool piece I’ve seen on a few rigs. I think Ken @KT40 and/or Mark @cppilot were looking into getting these replicated over in the 45 section. Brian @whitey45 or Mark @65swb45 might know if factory (@Living in the Past also).
I just did the same. Not in the parts book. Mine also doesn't have one...