If your on a budget -- replace the running lights first. These are the lights that are always on when the headlights are on. If your a good hypermiller then you aren't using your brakes so saving energy there won't make much difference.
If you replace turn signal lights you may have to replace your flasher. Older flashers are only designed for older bulbs.
If you pull one of the bulbs out does your "flashing" rate go up? If so you have an older flasher and will need a new one.
I bought my bulbs from the web site you showed.
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