After the success of rebuilding my carb and having it run for the first time

I'm looking to fix up non working brakes.

I plan to replace the master cylinder with the Wagner #F66857 cylinder described on various threads.

I would like to use DOT 5 brake fluid.

I have read I should replace the brake switch and flex hoses to avoid them melting. I'm guessing chemically melting?

Does anyone have part numbers for these parts or are they pretty much standard?

Thank you!