Neither Xcarlink, Connects2, Autoleads, Dension, Soundlinx, IQ, Maystar (nor any other manufacturer to my knowledge) have a solution for the Omega, and its unlikely that any manufacturer would invest any time or research into such an old car nowadays.
SUPASTU,
Please read the previous threads on this forum about mixing and matching BOSE stuff, virtually everything has been tries and virtually everything has failed, it is well documented and I must confess to be getting really tired of seeing and answering the same old questions now.
Anything BOSE and anything aftermarket in the Omega simply DO NOT MIX.
Changing any component within the Omega BOSE setup, whether it be the head unit, amp, speakers or wiring, will require THE ENTIRE SYSTEM to be changed, and that will include the head unit, amp, speakers and the wiring.
Now can we pleeeeeeeease move on ?
BTW - the BOSE sub in the USA Merc was a "bit of a hybrid" and was no means a full BOSE system like the Omega or other marques. As I recall, it was also such a poor performer that it was not taken up by the European market, who went in a different direction.