I am in the process of building an L67 for my 88 Fiero, and after cleaning them off I discovered one was badly cracked, but I thought the other one was good. I sandblasted it today at work and discovered several small hair line cracks on it, so I am now assuming it is also junk. Now besides "go to the junk yard and get some for $10" what are my options? I do not wish the repair them and take risk of them failing again. Is there a nice aftermarket option? Maybe someone makes aluminum? Also is it common for these to crack? Thanks for any input!