Delco two spark dual distributor assembly.
Rare dual-4 cylinder distributor base for Model t Ford speedsters, vintage race cars, sprint cars, Stutz, Pierce, and other large expensive 4 cylinder 2 spark cars. This can be used as a replacement for magnetos. This unit appears to be complete , but at 100 years old it will need to be restored. It does turn easily. When you turn the input shaft both distributor rotors rotate. Ultra rare and unique. When is the last time you have seen one of these for sale?? Bid early and bid often. Ask if you need additional information or pictures
Those appear to be the wrong caps for that unit.
They are the wrong dist caps. Those caps are Standard #DR165, should be Standard #DL12. The mounts are twist and lock, the caps have provisions for side clips.
Repost in the classifieds, Harold !