Tomascena

I have recently purchased a lovely 530i E39 2000 model and one one thing it didn't come with is its original Radio Casette. I purchased one from AMERICA of all places and the connectors are different. The unit i purchased has points on the back but the connector inside the dash is set up for slots. I did a bit of digging and found out the newer models had the slot connectors. Is there an easy fix rather than purchasing the correct unit???? Your help is much appreciated.