I expected, and hoped for, that the retainer from other cars would also fit, but I wasn't sure and no one ever confirmed this, until now. I don't want to ordering these clamps if not 100% sure they'll fit, otherwise I'll end up with a bunch of these things and, due to international shipping, it ain't exactly cheap. And selling them again here in Europe, well, not likely. OPGI has them on their site but listed for a 64-66 Chevelle. They look like they could do the job but they told me it wouldn't fit. Here's a link to the page; 1964-1966 GTO - Coil Spring Retainer, Rear | OPGI.com But in the meantime another member of the AACA (and also the ROA) made me an offer I couldn't resist. He offered to send me one from his parts car, free of charge (only have to pay shipping). An offer I gladly accepted and am very grateful for. This is also the strength of these kind of forums (or is it fora??) So much knowledge and help from amongst people with the same interest and thanks to the internet, the world became very small. As to you question Jim, I'm not a member of the ROA yet but I certainly will. It's only very unlikely that you'll ever meet me at a ROA meeting. Thanks for your help guys.