That is not a 69 shifter mount.A 69 mount is stamped steel and has a nut welded to it for the large bolt that passes through the sleeve that is in the center of the shifter body.The lower rear bolt goes through a slotted hole in the mount that has a special curved nut on the back of the mount that allows some adjustment fore and aft.I believe that the same curved nut is used on the mount that you have wich I think is from earlier big Pontiac's and A body cars. 68 Firebird may use the same mount as a 69 but I'm not positive.I do know for sure that the 70 and up mount is not the same as the 69.