fmaella

I just bought a new dash for a 1976 corvette. When I removed the old dash, the speaker mount bracket on the passenger side is missing. The new dash does not come with the speaker brackets. I want to install new speakers in the new dash, but of course I am missing one speaker bracket. I have searched Ecklers and zip-corvette and it seems like this part is not available. Can someone tell me where I can buy this part? thanks in advance