Redwood Fence Question

I live in San Mateo and need two of my fences replaced.
Each fence is shared with the neighbor, side fence side neighbor, back fence back neighbor.
One is 108 feet the other is 50 feet
I got a few quotes and it they all seem to recommend / quote good neighbor board on board fences.
The materials the all seem to use are the same:
Posts 4x4x8, 4x4x10 Rails 2x4x8, 2x4x16 Kick Board 2x8x8 Fence Boards 1x8x5
Which of the above should be pressure treated? Just the posts and kickboards? How about the rails?
Anything else I should look out for or request?
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Not sure they pressure treat redwood. If you are talking regular 'green' pressure treated wood and not actually redwood, I'd use it for all the wood. If you are mixing PT with redwood, I'd use PT for anything not redwood.

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