Okay, I will go ahead and answer part of my own question for those that might be interested. The transducer on the bottom is most likely a Moor speed transducer. Parts Information
The top depth transducer is still a mystery.
I purchased a Raymarine ST40 Bidata to replace these with. The Airmar transducers that come with the ST40 kit require a 2" hole and the old transducers had a 2 1/8" hole. Can I fill the rest of the void (1/16" on each side theoretically) with enough 3M 4200 to make a good seal? Or should I drill new holes? I would rather take my chances with making a good seal with the old holes, but I am looking for suggestions.