Bought my first set of step bits for this type of mod. El cheapo harbor freight versions, but just too darn easy to drill, size, drill, side, etc,,
Unclear why folks drop $$$ on the OEM sets. Aftermarket/custom are a fraction of the cost and, in many instances, can handle more juice than the OEM set up.
I dropped ~$20~ on a 15 Amp socket w/ 60" lead, fused, that I ran straight to the battery. Even with the step bit's, it's less than half or what they want for an OEM F6B socket,,, and Mo' juice ta boot!!! Plus, the 5A 'plug and play' OEM socket feed plug is still available for,,, whatever might be next!!!