Lightship37

Good afternoon from sunny South Wales UK. I recently purchased an Olympia ob-3ce acoustic bass (Indonesian built). Regretablly the headstock truss rod cover is missing. I have searched google for a relpacement without success. Any ideas where I could get one? Several online articles refer to them being made from fibrebaord which i have found online so it maybe time to get the scissors out and make my own!!!! Gratefull for any advice or signposting to a supplier. Thank you in anticipation.