Thanks again for the info. As for the AlInCo, it did look to me like it was a list of elements, but I also thought that it might be the brand name as well. Anyway, we came up with a used pair that are the same as the originals. They even have consecutive serial numbers. Up and sounding sweet. With the help of a Mac 5100. Also, whats the story behind the emblem on the grills, looks like a backward P then a W and then a K? Can you tell I'm a newbie yet? Thanks again.