ok so its not ebay but banggood, which is a wholesaler a lot of people on ebay dropship through.
12V 1W High Power LED Car Light Bulb White+Warm White - AU$2.65
$2.65 AUD, posted to your door from Hong Kong, in 7-10 wdays.
Ive used ebay/chinese leds like this on every car in the past 5+ years and basically.. if they survive the 
fitting of the globe (manhandling) they are good for ever haha.
Older styles were much weaker and could break when 'twisting' the bayonet into it. Not a problem with these newer ones, they are greattttttt 
 
Also on the too bright note, camera lens's do enhance lighting effects - take a look at the original 'dim' one and see how bright it looks in the pic compared to your eyes. The LEDs are definately brighter, but not going to dazzle anyone. On the 'bright' side, I can drive up my narrow driveway without headlights haha.
As for reversing, well.. those 1w ones probably wont cut it.. twin 7W crees? yes please. Also wiring in a 10W cree wide angle floodlamp for even more reversing lumens but thats not done yet ;-) will post pics when they arrive?
(the link/url i posted seems to be auto turning into an ebay advertisement for a different thing.. goto ebay, search for item 231283497987 for reversing lights, $2.56 AUD each side (so $5.12 total) posted to your door, 7-10 wdays)
Also.. heat is a non issue. The only issue is newer cars (like 2006 range rover vogues...) will actually think the bulbs blown due to the extremely low current draw and as such, the dash will say 'light blown' AND cut power to the socket! Intelligent motoring at its finest..
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