+1 to all of the above. SLA suspensions don't need caster/camber kits. The Mark VIII's upper and lower control arm design has plenty of adjustments. The shop you went to must have either mistakenly thought your Mark had struts in front, thus requiring caster/camber plates (like my Cobra has), which is unlikely, or they thought you didn't know anything about cars and were trying to feed you a line of BS to get more money out of you. I vote for the latter. Caster/Camber plates will have no effect on the Mark VIII's front suspension since, unlike a strut suspension, the air spring/shock has nothing to do with the alignment of the front end. Not to mention the fact that caster/camber plates don't exist for the Mark VIII because of the SLA front suspension design. I'd take it to another shop or to a dealership where they know what they're doing.