e3's have a shorter life than others. You're gonna get a lot of answers but I like the ACDelco iridium 41-985's.
RH is always the passenger side, LH is always the driver side.
I use a plug socket that has a u-joint made onto it along with a 2" extension.
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2010 Silverado ECSB LS 4x4. Only mods so far are a K&N drop in filter and a Rough Country 2" front level kit