The LEDs with PWM options built in will dim yes, they usually have 3-4 stages of brightness.
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6 for hvac? And why 2 different colors? And I had a guy say he used those twist locks and they worked. As far as the 20 dollar shipping it was bs but less bs then the 43 dollars I had to pay for duty threw customs! For that list of parts I ended up paying 120-130 dollars and that will really suck if the twist locks don't work!Those T10S-TW twistlocks are not the correct twistlocks for our trucks. They're not designed correctly and the contacts go past the copper contact paths when twisted to lock. They're correct for 09-12 Chinese military jeeps built by Chrysler.
I'm surprised you didn't get (6) 74-x bulbs for your hvac, (4) in one color and (2) in another.
Remember to post pics when you get them installed....also, that $25 s/h to canada is BS, it shouldn't have cost more than 5-10 bucks to ship to you.