I just rebuilt the Edson pedestal on my Catalina 30
, and these definitely look like Edson parts.
I am guessing Cinkel used existing Edson parts where they could.
What Cinkel MAY have done is bolted the pedestal guard support ring (Item "E" ? ) to the pedestal base using the two bolts "A" into holes "8", then attached the engine
control assembly to the support ring with four different screws.
This may have involved installing some type of threaded insert in the support ring, to accept the four screws.
On the Edson, the retaining bolts/screws are 1/4"-20.