It's real easy to look up parts on MoCo website as all you need is to save this link as it pertains to your 03SERK
http://www.harley-davidson.com/browse/browse_categories.jsp?FOLDER%3C%3Efolder_id=2534374309165834&bmUID=1181407397802&bmLocale=en_US
But here is what you wanted I am pretty sure as there were two choices:
Chrome Oil Cooler Cover Kit
Dress the Touring Oil Cooler in style. This Chrome Oil Cooler Cover is designed to hug the contours of the cooler body while allowing complete air flow across the surface. Includes required mounting hardware.
62995-04
Fits '99-'06 Touring models equipped with Touring Oil Cooler Kit P/N 62895-03A.
MSRP US $44.95
jeffj
This is where the Chicago Harley parts guy drew a blank, as many of the same models used different sized oil coolers. After all he is parts guy I have delt with for the last 10 years, so when he explained this he told to to ask some one that has it already on a 03 SERK.
Anyone own a 03 SERK and know the correct PN for the chrome oil cooler cover?
FWIW I went into HD Online>03 SERK>Chrome Oil Cooler cover and got two different PN#?
62995-04
Chrome Oil Cooler Cover Kit
Chrome-plated cover hugs the profile of your Premium Oil Cooler. Designed to dress up your oil cooler, this easy to install cover does not interfere with the airflow across the cooling coils.
63032-05
Fits '99-later Touring models equipped with Oil Cooler P/N 26082-05A.
&
63032-05
Chrome Oil Cooler Cover Kit
Chrome-plated cover hugs the profile of your Premium Oil Cooler. Designed to dress up your oil cooler, this easy to install cover does not interfere with the airflow across the cooling coils.
63032-05
Fits '99-later Touring models equipped with Oil Cooler P/N 26082-05A.
Does anyone know if the 03 SERK has the premium oil cooler?