There are multiple original radio options in the Nissan Terrano II R20, which option is the original fitted system?

The Nissan Terrano II was joint developed with Ford who sold a version called the Ford Maverick.

Sales began in 1993, with a basic single DIN radio fitted across the Nissan Terrano II, Mistral (JDM version) and Ford Maverick ranges. The Nissan enjoyed much higher sales than the Ford and by 1998 Ford had dropped the Maverick from their range, along with Nissan no longer selling the Mistral in Japan. 

2000 saw a facelift to the Terrano, including a revised interior with two different radio types available. A single DIN radio with the hazard switch sat in the surround, and a larger set with the hazard switch integrated into the radio. If you car is fitted with this set then you will need to also find the fascia panel from the single DIN version, along with the hazard switch. We used to sell the fascia with part number 50-198, but it has been discontinued. The Nissan part number was 68470-0X801.

The hazard switch is shared with the Nissan Primera P11).