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ADC is an Apple proprietary connector and Apple did sell the dongles for $149 & $99 back when.
I’m fairly certain that Apple’s dongles connect an ADC monitor to a DVI video card. The Belkin connector does the opposite. I’m not positive Apple didn’t make a similar Adapter but i know I paid more like $30 for the Belkin adapter I bought for a PowerMac G4 tower.
But it’s made by Belkin