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from googleing the numbers, I found this
NTK or NGK 28020 fits
08-09 VLR 1800
2009 Suzuki C109R Boulevard - [2 Sensors Required, Sensor 2 for Right Rear O2 Port]
2008 Suzuki C109R Boulevard - [2 Sensors Required, Sensor 2 for Right Rear O2 Port]
2009 Suzuki C109RT Boulevard - [2 Sensors Required, Sensor 2 for Right Rear O2 Port]
and found it here on ebay
http://www.ebay.com/itm/NGK-Spark-Plugs-28020-OXYGEN-SENSOR-SUZ-NGK-/310468103231
Found the same, but nothing reffering to a Napa part,I thought the point was to find less expensive replacement
Ah, MSRP is $341.79 and the FleaBay one is $137.42