Oh no no no no, the Gauntlets of Dexterity are very much real.
They can located during the Unseeing Eye Quest, in the Pit of the Faithless.
Kinda hard to describe the location, so here's an URL that has a map with the location marked.
Warning, contains Unseeing Eye spoilers.
Gauntlets of Dexterity's location, among others.
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If not a Sorcerer, then a Paladin.
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Baldur's Gate Item Mart