Looking for original style volume/tone knobs and a truss rod cover for a 1978 Ovation Viper. Got this guitar to complete a small collection that I put together to compliment my 1976 Preacher/Viper Hypbrid that was built by an Ovation tech for a guy in the town where I grew up. I now have an all original 75 Preacher and the 78 Viper to bookend my 76 Preacher/Viper. The Viper has the usual smashed pickguard (have ordered a replacement from the guy on eBay), but finding the knobs/truss rod cover is proving problematiic. Any help greatly appreciated. Thanks for your consideration.