As far as the "air struts"...you're incorrectly conflating the multiple air suspensions and shock choices based on a model year (2003).
There are multiple air spring/struts based not just on model year...but on the two types of air suspensions...as well as the sport or non-sport suspension option.
There are 2 types of air suspensions EHC I & EHC II which use different air spring/struts due to one being an active 2-axle system (EHC II) that can also be manually adjusted and the other being a static rear axle system (EHC I) which can be a sport or non sport strut.