I believe P/N: 28529-0P00 is the bulb for the clock. You can contact IoS (Infiniti of Scottsdale) - "infinitipartsUSA.com" to verify. It's @ $3+ each but shipping is $9. You can also try "Autolumination.com" from the link below and look (scroll down) for a "Neo-wedge LED" and try to match the dimension of the bulb you are looking for.
http://autolumination.com/74.htm
A cheaper alternative maybe Radio Shack Microlamps, P/N: 272-1092. It's rated at 12VDC, 60mA, 0.15 MSCP brightness with 1" wire length. At <$2 a pair, it's a huge savings if you can make it work. Refer to link below. This bulb can be used in some of the backlighting requirements of Infiniti/Nissan cars. You may have to be creative during the replacement procedure - unwind the original bulb from socket, insert new bulb and wind leads, then cut off excess length.
http://www.radioshack.com/product/index ... Id=2103780