Kancil's original air filter screw...

[trueno]

last time wash my CLK...hand itchy open the air filter screw to check filter....then after that forgot to screw back the screw...i drive my CLK then run on halfway to work...i heard sound "clak...clack.."...baru reliase that my filter cap screw din screw back,and the screw fall into engine bay....hit the air-cond band....then aircond band kong liao...where can i found filter cap screw huh?i scare water go in to my engine leh... :( :( :( help leh....