Those state they are for 24 volts. Don't know if that is maximum voltage, more than likely is what they mean.

I wouldn't advise using the LED's on the the dimmer circuit. It seems as though any complaints about LED's burning the traces have been from owners who still have the rheostat enabled. I've jumpered all my cars to by-pass the dimmer and have never had a problem with with burnt traces.

Might just be sheer, blind luck on my part but it is something to take into consideration.

No reason to replace the directional indicators. They are "on" such a minimal amount of time there would be no benefit.

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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now