signal and hazard lamp flasher unit replacement

I want to replace my flasher unit because the hazards on My 1970 ARR 'Cuda don't work, and signal lamps flash quick and sometimes and slow others.I was looking at the year one catalog, theirs is a round shape, mine is a rectangular shape, which fits into a sleeve bracket, that is attached to the dash support brackets, am I looking at the correct piece under my dash?
Thanks.
Author: ZNormT6