Well, I have a set of Campag 3-arm cranks, mine are steel arms, cotterless. I also have some of the TA 3-arm cranks, alloy, cotterless. The rings are interchangeable between them. Original rings on the Campag were rivetted together, the 42 to the 52, with the 52 attaching to the spider. A while back i bought a mixed batch of 9 NOS TA alloy rings on the bay for just $8.50. When I got them they were the correct BCD, but the actual mounting/CR holes were too small, but that's a very easy job to open them up with a drill. A very cheap way of getting rings for that crank BCD.neill "orange boxes full of rings" currieHillsborough, NhNeill Currie6 Emerald DriveHillsborough Nh 03244tel: 603-464-0250 ------------I usually have classic bicycle components for sale at good prices. Please email me for a current list. A reasonably current list may be seen here:http://www.geocities.com/neill1234/ForSale.html------------The Mountain Goat website is at:http://www.geocities.com/neill1234/index.html?1011568933040------------