I just bought a lovely Romulus complete. It came complete from Riv in the early part of this century and Riv's standard build included 170mm crank arms. I'm a devoted 172.5mm guy so I switched them out. The rings were pretty toast, so I'm selling just the arms with no rings. $60 shipped anywhere a USPS small Priority box will go. These have a cute retro early 2000s logo but the same "XD2L" and "XD2R" forgings we all recognize.
Photos on Flickr are here:
If you've got a budget road build coming up, or have unconventional ring choices coming, these may be what you want. As, always, I'd trade for 172.5mm and put them in my inventory.
Bill Lindsay
El Cerrito, CA