Need more information dude. What exactly is it that you're trying to do?
Are you trying to fit 262mm front brakes and 240mm rear brakes to your EG8 (originally 240mm front and drum rears)?
If that's the case I don't know why you're trying to use EK1 front calipers with a DC4 knuckle. Fairly sure EK1 has 240mm front brakes (someone correct me if I'm wrong). You can just use the DC4gsi/DC2vtir/EK4vtir/DelSol front calipers as they should all be the same, and they're meant for 262mm discs.
As for the proportioning valve, try to get one off the same model of car that the brakes came from.
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