Lexus IS300

The Lexus IS is a series of entry-level luxury cars / compact executive cars sold by Lexus since 1998. The IS was introduced as an entry-level sport model. The first-generation, inline-6-powered IS featured sedan and wagon variants.

Information provided by: https://en.wikipedia.org/wiki/Lexus_IS#First_generation_.28XE10.29

Wiring Information
the APP0258 should suit is300 up to 2005
the APP0259 should suit is300 2005 on