Iridium Spark Plugs - 1999-2017 Twin Cam, 1986-2020 Sportster Models Mirrors Handlebars & Controls this battery box works great

this battery box works great for custom projects

Drilled and tapped full depth (all the way through)

Tunnel Height: slopes from 3-7/8" at the front to 1" at the rear

The only way to upgrade those are to purchase items like cartridge emulators

Pivot bolts have 1/2-20 threads

Iridium Spark Plugs - 1999-2017 Twin Cam, 1986-2020 Sportster Models Mirrors Handlebars & Controls this battery box works greatIridium Spark Plugs 1999 2017 Twin Cam, 1986 2020 Sportster Models Iridium electrode is smaller than a standard electrode; requires less voltage Hotter spark and extended spark plug service life compared to conventional plugs Has the distinctive black ceramic with red lettering and gold colored corrosion protected coating on the metal shell Exceed OEM specifications for plug service life Sold as a pair NGK Reference # DCPR7EIX HD Reference # 6R12