Harley Davidson Spark Plug Thread Repair – How to Fix - Wise Auto Tools LLC
Champion® 810 RA8HC Copper Plus 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
One Used Harley Davidson Spark Plug 6R12 | eBay
Champion® 404 RN12YC Copper Spark Plug for V-Twins - Replacement for OEM# 5R6A on 1984-2000 Evolution and 1975-1980 Shovelhead (1200cc) Harley Motors - MADE IN USA - Billet Proof Designs
Replaces Harley-Davidson 6R10 MAGNUM Brisk High Performance Sparkplug