1964 Valiant Single to Dual Master Swap Question

Finally got my replacement. I went with a MC36221 this time around. Seems like a more popular option. Do I unscrew the little pointer? I assume that is holding the piston in until I screw on the boot and stop?
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Here is my existing Brake Block. I have a new brass one on the way made for dual bowl conversions. As I need to replace lines and I want to keep things looking stock, what are those old style flex brake lines called? Can they still be had?
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-Todd