What year and model of car are you refering to? On new Porsches today, there are a thouroughly confusing array of leather options, nothing is a package any more. Back in the '80s, U.S. model 911s came w/ partial leather as standard equipment, (leather on seating surfaces of front seats and steering wheel only), with 2 further levels of amounts of leather available, do a search in archives. It has been explained in great detail here already.
