Not sure what set you are looking for really!
Attack Power Set
Green tinted goggles
wsg neck
serpent shoulders
glowing lizardscale cloak
tunic of westfall
forest leather bracers
gloves of the fang
blackened defias belt
leggings of the fang
feet of the lynx
wsg ring
seal of wyrnn/sylvannas
pvp trinket
agm
shadowfang MH
assassins blade OH
Mocha may be able to weigh in on this a little better!
It would have made more sense to do Assassin's Blade + 5 Damage MH and Cruel Barb + 15 Agility offhand. But this is where it's at for AP for the most part except I don't think Blackened Defias Belt gave good AP back then.
For AP set I'd do:
Attack Power Set
Green tinted goggles
wsg neck
Feral Shoulder Pads or any other white shoulders
Sentry cloak / WSG Cloak
tunic of westfall
Wrangler's Wristbands of Attack Power
Red Whelp Gloves / Scouting Gloves of the Monkey
Deviate Scale Belt
leggings of the fang / Scouting of Attack Power
feet of the lynx / Scouting of Attack Power
wsg ring / Meadow Ring of the Tiger
Meadow Ring of the Tiger / Lavishly Jewled Ring
pvp trinket
agm
Assassin's Blade MH
Cruel Barb OH
However, you only wanted to use this set perhaps 1-2 times per WSG game just to drop a FC but it was not recommended to do a full AP set.
Bis
Green tinted goggles
wsg neck
Feral Shoulder Pads or any other white shoulders
Sentry cloak / WSG Cloak
Blackened Defias Armor
Wrangler's Wristbands of the Monkey
Red Whelp Gloves / Scouting Gloves of the Monkey
Deviate Scale Belt
leggings of the fang / Scouting of The Monkey
feet of the lynx / Scouting of The Monkey
wsg ring / Meadow Ring of Eluding
sylvannas / Meadow Ring of Eluding / Lavishly Jewled Ring
pvp trinket
agm
Shadowfang + Lifestealing
Cruel Barb + 15 Agility
If you need to drop an EFC switch to dual Cruel Barbs + Fiery.
Back then Blackened Defias Belt was green and gave like 5 stam and Belt of the Fang was green and gave 3 stam 2 agility. I think glowing lizard scale had class restrictions and rogues couldn't use it.
Edit: Serpent Shoulders were still good white shoulders, but Feral Shoulder Pads were better. Serpent Shoulders didn't have stats until 2.3, the patch that made all of the low level dungeon drops blue that were previously green, introduced Rugged Spadulders which were the same stats as Serpent's but with slightly lower armor, lowered the mobs levels in SFK etc which is when Shadowfang became very rare. This patch also made Thief's Blade blue and actually viable. I believe this is when Blackened Defias Belt became a good AP option. Arugal went from level 26 to 24 RIP and shortly after to level 21. Also this is the same patch that pretty much cut dodge rating by 75% so it was now theoretically impossible to stack dodge over 100 without evasion up. I remember this patch because this is when I was most passionate about twinking and played twinks 24/7. I was playing a self funded gnome rogue on Illiidan and self funding a twink back in the day was a HUGE feat. I did have to buy gold a few times since I had no mains or alts but my rogue came out good. I got lucky with Serpent's Shoulders binding and becoming BIS as Feral Pads were too pricy and rare. Talbar Mantle sucked for anything that didn't need INT because the amount of armor you lost for going with Talbar was astronomical which is why nobody bothered to get them besides int classes. (Still happy I have them on Mocha though)