Did our 1st "mods" tonight to our '15 Suburban LT.... swapped out the reverse & license plate bulbs with LEDs
For the Reverse bulbs, I ended up ordering the "Philips 12841B2 White Exterior Vision LED Bulb (Pack of 2)" from Amazon. The came in over the weekend and I popped them in tonight. Installation was fairly easy as mentioned elsewhere - remove the trim piece that covers the Torx screws that secure the light, remove the screws and gently pull the taillight assembly out. I had to use a pair of pliers just a bit of force to get the reverse light connector to rotate and extract from the housing - but then the bulb was a quick swap and put it all back together.
The pics don't really do justice, but here is one with the LED in the left side, and OE in the right...
Then a close-up of the tail light with the new bulb - definitely looks better with the whiter light - and definitely brighter.
I'm not sure I'm in love with the Chevy taillights... I sort of like the GMC tails, but they are what they are, and it's my wife's vehicle, plus you don't really see the rear of the vehicle when driving, do you
On the license plate bulbs, I saw Philip's had some that would supposedly work - and came in a 2 pk, but decieded to go with what others here recommended - the SYLVANIA 168/194/2825 LED Premium White Miniature Bulb -- they only came as a 1-pk on Amazon, and 1 was almost the cost of the 2 pk of Philip's bulbs.
Before with the OE bulbs
After with the Sylvania LEDs - a much more attractive white light