Was a few days ago, but I made some LED puddle lights for my mirrors. Yes, they have some plug-and-play for ~$25 but I like COB LEDs and got a pair of these COB panels for $6.
The white part is an aluminum plate. They come with foam double-sided mounting tape on the back, which I peeled off. I used a flap disc on a grinder to shave off the length and corners so they'd fit in the housings:
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This was a spare housing used for test-fitting. The original housings and lenses were soaking in hot water and dish detergent in a Ziploc bag so they would clean up more easily:
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I haven't had an opportunity to take comparison pics yet. But, they work great. Cost me $6 and few drops of super glue. I'm not so poor that I couldn't afford the extra $19 for the pre-fabbed ones. I just wanted these LEDs over SMDs for this particular purpose and it was a small and easy project to occupy my mind and hands for a couple hours.