From aftermarket Blaupunkt to 4 channel oem Radio. Possible with early fader wiring?

[IS300E30]

I have a 7/87 325ic that came with the fader on the dash.

The oem setup was adjusted with StereoInstaller1 and with his Amp bypass for setting up an aftermarket deck.

Is there a way to now convert my setup to the oem 4 channel non fader oem setup, so plug in a radio such as http://www.r3vlimited.com/board/showthread.php?t=341442

The above link is not my radio, but, I have the exact same model that I am hoping that I can hook up in my car.

[StereoInstaller1]

Yes, of course, same wiring as any other aftermarket deck.