As far as the reverse light being in a different position, nothing a harness extension can't fix. Just get some wire and butt clips and you're laughing.
As for the eBay sellers and their "will not fit step side or splash models"......they are talking out of their @ss. All tail lights from 93 and on fit in the tail light hole. The lights themselves have stayed the same size and shape, just the bulb configuration (2 and 3 bulb set-up's, and reverse light position) and harness has changed over the years.
Those one's you linked to eBay will fit your Ranger.
2001 Ranger Edge - Bright Island Blue3.0L/5-Speed Manual/Supercab/Stepside/Sliding Rear Window/Step Bars/31x10.5 BFG All Terrain T/A's on Factory Chrome Rims/Class III Hitch/Black headlights & Corners/Black Tail Lights/Titanium Chrome Corner & Signal Bulbs/Sylvania Silverstar ULTRA Headlights & Fogs/Ventshade Window Vents/Tonneau Cover/14% Tint/Pioneer Deck w/ 2x12" Pioneer Subs & Clarion Amp/MAC Intake/Leather Seat Covers/Bilstein Shocks/Westin Safari Bar with 6" 130W Blue Tint Fogs/2006 Fender Badging/LED 3rd Brake Light
Too much to list, check out my Cardomain
PROUD TO BE CANADIAN