Keep looking, bosch refills are out there. While I don't think they are the same as the MB OE part Autozone sells bosch refills.

__________________
Jeff M.
Mercedes W123 DIY pages are now located here.
1983 / 1984 300D Sold
2000 CLK430 Cabriolet ~58k Sold
2005 Avalanche 4x4 ~66k