Being in NZ the supply of them may have been different too - for example, the four cylinder Rover engines were never sold in Australia in the coil spring models. Only ones were the V8 and the Isuzu, then the 200Tdi in 1991 when the Defender was introduced (110, 120, 127 discontinued when the Disco was introduced in 1990 - 90 was never sold here until after 2000)
John

