Paint colors for 1988 XJR-9

Hi, everyone, new to this forum, but not to beautiful British machinery. I am working on a project and was wondering if anyone could help out with a little dilemma of mine. I am looking for the color codes for the purple and yellow featured on the Silk Cut 1988 Jaguar XJR-9. I can find model scale paint, but am looking to have polyurethane paint mixed at a local paint shop. Any help is appreciated!

@ptelivuo, this seems right up yer alley!


Flattered, but a bit too new for me and also unlikely that the race car liveries would have been in the sales brochure colour samples.