Until others chime in, what I remember about the flasher units it that it'* a simple unplug and replug in unit. There are usually to flasher units. One for the turn signal and the other for the emergency flasher. In the ol days, the turn signal was a 2 prong and the emergency was 3 prongs. Unless the flasher was completely gone, I used to turn it on and listen in order to locate. Sometimes they were part of the fuse panel there easy to locate (if you knew where the panel is.
May we ask why you think you need a replacement?
Long Live My Bonneville 97 SSEi Dark Cherry