Do you mean like pictured with the -1492- instead of "like the optional dealer installed 6-disk unit pictured with the Becker -1432- head unit"? (I know, a guy can go nuts with all these model numbers - that's why I had to put this page together to try to keep things straight:-))
I'm thinking what you have is actually for the 1994 and on cars (that's when the 1492 replaced the 1432). And this may be the equivilant to the Alpine mentioned
here. So you may be able to convert with the correct cables. Maybe the folks at
audio-etcetera.com can help you figure it out. They seem to have all kinds of cables.
Please let me know what you find out...I'd like to know if your part number is indeed the one that goes with the 1492. Thanks.