1969 Chevelle SS 8-Track player mounting help

[69nut]

I have a 1969 chevelle SS that came with a 8-track player (stereo tape system). I have the 8-track player and mount bracket, but where the bracket mounts to the bottom of the dash under the ash tray i am missing something on the right mount hole. There is only plastic to mount to on the right side, Am i missing another bracket or something. The left one has part of the metal dash bracing to attach to and there is a center bracket hanging down on the ash tray to mount to the back of the 8-track player. Just need to figure out the right hand mount hole on the 8-track bracket. I would appreciate any help. Thanks Dennis