Click Here to reference Sportster VIN Information in the History section of the Sportsterpedia. 
Click on any pic to enlarge: 
Part# (49376-10). This frame is OEM for 2010 Sportsters (883 or 1200 engines, excluding XR1200 and XR1200X models). 
The VIN is factory stamped in the neck with a VIN sticker on the downtube.