You really wnat to get the best you can afford, Magnecores are pretty highly rated and usually last a lot longer(hence the price) and are more efficient. Otherwise Bosch Rover V8 ones are pretty good value.
Land Rover V8 Discovery should do the job. The extension bits that are actually also suppressors but are needed to stop the lead melting on the manifolds are a Vauxhall part. As said, better to forgo a tank of fuel and get a decent set.
