New install

I will be picking up my new 2016 Crownline 255SS with a Mercruiser 6.2L engine just as soon as the weather breaks here in Buffalo.
There is a spot in the dash for a Raymarine A6* unit.
My dealer says that he can only do the A65 but I question why.
I would like to install the A68 with Downvision and Wi-Fi and CPT-100 transducer along with the NMEA module and wire harness/cables to hook to the engine’s ‘Smart Craft’ port.

Can you please advise a complete list of components I would need to complete this installation.

Thank you