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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
What year is your truck? If you go online to autozone or advance auto's website you can look up the bulb part #. I don't know if they have changed for some year models or not. On my 02 I know that those bulbs are not monitored by the "bulb out" CANBUS system so an LED probably would not need an extra resistor - not sure how it is with the TIPM systems.
As far as the red coloring goes... that may be an issue with local law enforcement depending on your area.
They should be plug'n'play. Just remove your bulb and put the LED in. They are polarized though, so if you have them plugged in and they're not working, flip them around and try again.