Join Date: Oct 2007
Location: West Yorkshire, United Kingdom
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No, Shimano STI shifter pods are full integrated into the brake lever, add to this the STI hasn't been produced for several generations of groupset now (think 10+ years) so getting one even to compare with would be hard (you can see visually this won't work from the tech docs http://techdocs.shimano.com/media/te...9830612199.pdf
The chances of using the separate pods most likely won't work either, as they all have different mounting systems.
If you are looking to upgrade to 9 speed, would look at selling the 7 speed hardware, it's retro now, and XT level should get a decent return, check out retrobike for this, and you may be able to fund a pair of separate brake levers and a shifter pod through this.
One thing you didn't mention is spec of your wheel, being from 1993, this should be a hyperglide cassette / freehub, but 7 speed freehubs of that age are only 7 speed, and can't take 8/9/10 speed cassettes with out replacing the freehub body with a more recent one.