Looks like they go the length of the undercarriage so I would rule out heater lines. Buth then again, what else could they possibly be for? Someone even took the time to drill holes in the cross member to pass them through.
Unless I'm disoriented, looks like the vacuum line off the brake booster
The brake booster line is to the right of the tubes in question and the vacuum tube turns upward behind (car forward) the e-brake bracket. The vacuum hose can be seen above the e-brake bracket. The other two tubes appear to be copper.
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