Air filter replacement SL500

After getting a quote of $160.00 to replace the air filters in my 2000 SL500 I decided to get the parts and do it myself. The parts were $40.00 for two air filters. Now, does anyone know how to get to the air filters. I am unsure how to get the plastic cover off the top of the engine. It does not appear to be screwed on and cannot find snaps holding on eithier.
Some direction would be very helpful.

Thanks,

Keith

Remove the snorkels and the plastic cover/airfilter box just lifts off (may take a little effort). Turn it over and there are clips or maybe screws holding the cover on the filter (one on each side). replace the filter and reinstall the assembly on the engine.

Thanks! Instructions were right on!