Don't do that! Trust me, you'll fry your dimmer switch and its like $100 from the dealer.
If its too bright and you don't want to add a dimmer, then yes, a resistor will work. BUT, it will get very very hot and unless you have a secure place to put it (which really is nowhere down there, ESPECIALLY with your SRS module right there) then I recommend against this method.
You bought an SMD led. Also referred to as SMT depending on the led. That led is designed to be super bright. Its part of the technology. Notice how its flat, square shaped, and appears yellow... that means its bright! You need a regular simple let like this:
LEDs are so cheap, I recommend skipping all the hassle of trying to make it less bright when you can spend less than $1 and just get the correct led. Trust me, don't thr to get fancy... your stock dimming circuit is very sensitive and you run an EXTREMELY high risk of blowing out your entire dashboard lighting if you do it your way! Trust me, I've seen I happen