[s-cars] source for CHMSL bulbs

[Lee Levitt]

I'm having a devil of a time finding replacement bulbs for the CHMSL 
(upper rear brake lights on the tailgate) on my C4 A6 avant. According 
to the book, the proper bulb is a Sylvania 70. Neither nearby FLAPS 
carries this particular bulb. Amazon also doesn't list them.

Does anyone have a good source for this bulb, other than the dealer? Is 
there a cross referenced number that's easier to find?

Thanks!

Lee