Loosescrews has Sora 7-speed/double STI.

http://www.loosescrews.com/index.cgi...d=290052515207

Personally I would not buy used STI levers unless I was able to inspect them and make sure they actually work. But even if they work fine, you really still won't know how worn the internals are and how much life is left in them. My old STI levers worked fine (for about 5 years) up until the day they didn't

"8 of 9 on 7" will work only if your hub is HyperGlide freehub. Early 7-speeds were freewheel or Uniglide freehub. HyperGlide didn't come around until about '89 or maybe '90 for RX100.