I bought these particular ones when we were in Florida earlier this year Kev. But they're on ebay look up mylitco. Search cree bulbs. Mine were posted up to Orlando from Miami and They were Around $10 for a pair. I since put some 501 style ones in the front marker lights in the front bumper because they show to the side as well as the front. These were from mylitco at £9.95 for 2.
Yes they're a direct replacement, my car is 2000 model year.
If I can get some decent photo's I will post them for you to see.
Cheers, Tony.