Where can I get a new ECU for my classic 911?

Where would you suggest I get a replacement ECU for my 1990 Porsche 964 Carrera 2 Cabriolet, part No: 911.618.124.04?

Where can I find rear headrests for a Nissan Micra?

A good friend of mine has just bought a 2002 Nissan Micra. This came without head-restraints on the rear seats, and she's been told by a dealer that no models of this series were fitted with them. Given...