Like Jim stated, try Crutchfield. They should be very helpful over the phone as well. Quadratec sells install kits for Sony's that are plug and play, harness adapter that connects to factory and is Sony specific. I have a Sony head unit with a Scosche HU mount and speaker wire adapters. No cutting or splicing.
'97 XJ Moss Green Metallic. 2DR. 2WD AW4 tow pkg.,3.73 gears. Firestone Destination A/T 225/75x15.