Great Plains Audio has soft parts kits for almost all Altec drivers, perhaps they would be able to help with an EV?
They'd be someone to check out at least...also, try posting on either Audiokarma.org or Audio Asylum, could be able to help you out. AK's got a bunch of vintage nuts that know where to get hard to find parts //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif