Mavic G40s and MA40s are both vintage rims from the same period as the GP4s. The G40 preceded the MA40, both gray with eyelets, about 13 mm wide inside, 19 mm outside.The MA40 is a bit "squarer" in shape with sharper corners than the G40. They're both available on eBay, sometimes unused, relatively affordable. Before these were MA3, MA2 and the Module E. Some of those came silver -- perhaps all Module Es were.