Police said Sam Walker was crossing Hardy Lane, Chorlton, with his mother, sister and cousin on 9 February 2003 when he was hit by a silver car.
The suspects made off in a silver Rover car which they stole from the house.
They want to speak in particular to the driver of a silver Audi car which was travelling west, who they believe could be a witness.
Another key area of the prosecution's case has been forensic evidence linking Mr Richards to a stolen silver Volvo XC90 - a car seen speeding off from the Siddiqis' home shortly after the stabbing.
Mr Richards also said insisted he had not driven a stolen silver Volvo XC90 - a car seen speeding off from the Siddiqis' home shortly after the stabbing - that day, but driven it as a favour for a friend around a week before the killing.
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Directors in the Aston Martin heritage program had searched extensively to find the perfect vehicle for the movie, and they transformed the one they found from green with a beige interior into a Silver-Birch painted car with black trim distressed to add the patina of age.
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Our unfortunate car was a silver 1987 Mercedes bought from the publisher of a Serbian news weekly.
Later that night his car, a silver Peugeot 306, was found on the A467 between Risca and Crosskeys.
The detective said the silver car was a mark four model, meaning it was made between 1998 and 2005.
He was see in the Abercarn and Risca areas, and at about 23:45 GMT on that night Mr Vaughan's car, a silver Peugeot 306, was found by police on the A467 between Risca and Crosskeys.
Swiss-based Sauber are perhaps an exception to the rule this year, unveiling a car with a new silver livery and noticeably slimmer sidepods.
The witness said he drove Mr Coats and Mr Wade back to their car, which he said was a silver Astra.
For the most part it looks like a sleeker hatchback version of a Chevy Cruze, highlighted by a solid silver grille up front with a black roof and matching trim along the windows and at the rear of the car.
Instead the couple's silver Ford Escort was sent into a spin and collided side-on with a car coming in the opposite direction.
Today, sitting abandoned in the field, is the smashed-up silver van, and next to it a small, red, three-wheel car which belonged to his father.
They then proceed to a spacious art deco dining car, whose tables are set with linen tablecloths, fresh flowers and silver.
In 1907 Rolls-Royce created the first Silver Ghost, which completed a 14, 371-mile journey, and was considered an elite motor car.
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