I am putting my old De Rosa back to it's original state with a 1st generation C-Record group and I have a problem---the part of the rear derailleur that rests on the frame's dropouts is cracked and broken. I don't know what this part is called so I have taken an image from the Hilary Stone website and marked the piece that I need with a red arrow below.

I don't necessarily need this part to be Campagnolo, I just want it to function, does anyone know where I can find a replacement part and, also, what the heck is this thing called?

Thanks!

Hi it is called an upper body bush part no. 7116064

you can find steel replacements out there somewhere.. used to be a guy on ebay. Check with CR folks for contact info. I think he was in switzerland, but others may have started making them too.

Two possibilities, one quick fix with J-B Weld or go to Ebay and pay dearly through: pb*bikes "https://www.ebay.com/itm/NOS-Campagnolo-C-RECORD-first-generation-Rear-derailleur-stop-Rare-replacement-/310709317872?pt=US_Derailleurs_Rear&hash=item4857b7f0f0" at $200 or try Tracker 5000: "https://www.ebay.com/itm/Campagnolo-C-Record-Rear-Derailleur-1st-Gen-Spring-Stop-Plate-7116064-NOS-/300944226685?pt=LH_DefaultDomain_0&hash=item4611ac797d" for $79, both have free shipping. Some say that there's hardly any difference with or without rear derailleur stop. One of Campagnolo's bad idea's or material used. I have the last generation of the first with the stamp logo, does not require the rear derailleur stop.

You have a better chance of finding a bar of gold on the side of the road.

Thanks for the input folks, that is what I expected, that this would be an expensive and hard-to-find piece. I don't have access to the CR list, can anyone do me a favour and check it for the guy who has steel reproductions for sale?

I would pay the $79 for the original in the auction that gioscinelli posted but it will probably just break again...