See if this diagrams helps.
-The brackets circled in blue are what mounts the column to (just below) the dash panels at the pedal bracket.(I dont have a photo of this). Its possible your pedal bracket has at least the upper most bracket having 2-studs sticking down. (I've attached as picture of this bracket so you can see)
-The brackets circled in red are thin sheet metal 2-piece brackets that mount the column to the firewall befroe it exists the firewall. (see photo attached about this). The middle piece circled in purple is just a rubber gasket.
With the exception of the rubber gasket, I've not been able to find these brackets as after market parts. I know this column inside and out becuase I not rebuilt mine, but I also bought a used column and rebuilt it as well. But I dont have the brackets for it. I see them all the time on ebay. Send me a PM if your interested in the steering column.
'66 Ragtop, vibrant red, 289-4V, 4-speed toploader
'68 Fastback, space blue metalic, 351C-4-V, 4-speed toploader
'69 Mach I, (Pending Resto Project)