I finally found a place to buy the swivel head street 90s to attach the Aks to my old Brute II manifold.
Thanks to JP and other posters for the great help.
The fittings turned out to be hydraulic fittings.
But my AKs suction side threaded connection is shorter than than the hi-side connection and the fitting wont snug up on suction side.
Both transducers look to be properly mounted and I don't know if I should risk removing the suction transducer to see if it's pushed in all the way flush. (Afraid I might void warranty).
Any suggestion would be helpful.