the link below lists a part # that's different than the Honda internal one, but it's a start. BTW, didn't the part you removed from your car have a part # stamped on it anywhere?

http://www.hondaautomotiveparts.com/...=FRONT+FENDERS

in case the link above doesn't work...

www.hondaautomotiveparts.com
select your model/year/trim/transmission
for system/component: select FRONT FENDERS
on resulting page look for COVER, ENGINE (lower) $28.63

hope this helps