#1
I own a Gibson SG Special. Who here knows what the '61 and '68 SG's had for stock humbuckers back then? I think the '57 Classic humbuckers but I am not sure.
Gear:

Gibson SG Special

Dunlop Cry Baby Wah pedal
BOSS DS-2 Turbo distortion pedal
Digi-Tech RP-1
#2
back then Gibson probably didn't have the same pickups they do today

just get any PAF styled humbucker
#3
You would probably get the same tone with some Burstbuckers or some 57 Classics. Maybe some of 'The Mule' pickups by Bareknuckle, they are built to the same specs.
Cam Sampbell's my hero
#4
Yeah, right now I have a '57 Classic humbucker on the bridge position. Then the stock R490 on the neck position. So I have been thinking I should put another 57 on the neck position..To make it sound like the actual SG's...
Gear:

Gibson SG Special

Dunlop Cry Baby Wah pedal
BOSS DS-2 Turbo distortion pedal
Digi-Tech RP-1