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Probably GPA has them. Its also really easy and cheap to pickup the material at any auto parts store along with a cheap hole cutting set and an exacto knife for the small and large holes respectively)and make your own. Then its also easy to make a rubber washer for softmounting virtually anything. Even an old inner tube works ok, but good flat roll material is easy to come by from auto parts stores and some hardware outlets.
Where may I obtain 5 gaskets for my altec 288K H.F. Drivers? This is the gasket that goes between the driver and the 30162 throat (without raised step) for my 805B horn. The Altec gasket part number 21270. The gasket is 2" O.D., 1.406" I.D., and 0.125" thick. Thanks, Reed
As someone else mentioned one time, pick up some of those round, cardboard drink coasters from your favorite watering hole. They're almost a perfect match for the Altec gaskets.
Scratch previous post. I was thinking of 1" drivers.