It should have a hole in it for a drive in retaining pin that is bigger than the hole in the distributor shaft that holds that plastic spacer retainer on the distributor shaft to limit the up and down movement of that shaft, I think that is he part
You may try buying a small parts rebuilding kit to get that spacer and a new drive in pin, if they are still available, the other option is to get another junk distributor and rob the parts you need for yours