I have a NOS Motorsport Boss 302 Windage Tray on EBay right now. It is a perfect replica of the original Boss part. My user name is GT350T and the Buy it Now is 149.00
Here is my listing link if works otherwise you can contact me directly.
Steve
https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F183978693854