There are actually two different types of original bulbs for the instruments -
Y0162.02A8 - BULB, instrument cluster, backlight.
Y0163.02A8 - BULB, instrument cluster, warning lights
I imagine the warning lights are slightly brighter - the only obvious difference looking at them is that the glass bead section is slightly bigger on one.
On my Uly I had the background lights all fail within a relatively short time at around 80,000km and there were none the country (Australia) at any any dealer.
I found some locally available replacement globes that could be fitted to the Buell plastic bases with a little work.
I also ordered the Genuine Buell part - this is the warning light and the replacement packet of 12V 60mA bulbs I got from Radio Spares. The replacements were about AUD$1.80 each so very cheap.
Now having said all that you can also get very similar bulbs in different colours from your Range Rover dealer - this photo shows a green one sitting beside the Buell item. A friend has a Range Rover and produced this when I told him about the trouble I had sourcing the Buell parts. He also had orange bulbs for the Range Rover but I don't know what they cost.
For those of you in the US American Sport Bike supplies LED replacements for these bulbs as another option.