I installed a few of these in my outside lights. Several are being used in my cargo trailer too.
The also have a lifetime warranty, which may not be the case for some of the lights from ebay or Amazon.
http://www.rv-led.com/1141-LED-350-Lumens-Cool-White-10-30vdc_p_69.htmlI am using the cylindrical style LEDs for my interior fixtures.
The flat panels from ebay/amazon won't work for everyone because some of the fixtures have a domed shape above the bulb, therefore it's not easy to stick something to it.