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Yes, that's right, the only 7 speed brifters Shimano ever made were the first gen of RSX ones from the mid 90's, the later versions were 8 speed:
http://www.velobase.com/ViewComponent.aspx?ID=f21bcbc7-3bae-43a8-8c47-e9c350f15e8e&Enum=125
I bought a pair of the 7 speed ones for a project that never materialised, and have the matching rear mech, not sure if I have the front mech too, but if interested I'd sell them, pm me for details, they look identical to the photo on the Velobase link...
GreatSince78
Fyo
I think the only 7 speed Shimano STIs were RSX and they would typically require a Shimano rear mech to work with. The shifters will make the Weinmann brakes even worse as they pull too much cable. You'll also need some kind of cable stop where the current gear levers fit and so hopefully they are the braze on type.
Looking at eBay you'd do well to get the STIs for £30, rear mech for £15, brakes for £20, cable stops for £10, new cables throughout? £30, bar tape £10...