Champion 1 Spark Plug RA8HC Harley Sportster Seventy Two Iron Custom | eBay
Champion Spark Plug RA8HC for Harley-Davidson Road King FLHR (ABS) 2008-2016 - Walmart.com
Autolite® 4164 Copper Spark Plug for V-Twins - Replacement for OEM# 6R12 - Fits 1986-Up Sportster (XL) and 1999-2017 Twin Cam Harley Models and All 1988-2008 Buell Models - MADE IN USA - Billet Proof Designs
Champion Copper Plus Spark Plug for Harley Davidson Twin Cam '99-17 and Sportster '86-18 - Sold Each - WestEndMotorsports.com