how to connect blaupunkt cd player to Vauxhall astra?

hi i had a factory cesset player in my astra, i took it out and i bought a new cd player which is blaupunkt but the problem is that the looms,,the wires are not accurate,,what i mean byt that is when i connect the audio wire from the car to the cd player it does not fit becouse the pinns are not in order, do i have to buy a adapter?,please i would be very gratfull if you help me, either advise me in this website or email me at killa2killa@hotmail.com
thank u
kam