I bought the MP XHD's fearing they would really jack the back end up... I bought two Left springs as the right side (passenger) spring does have ~1.5" lift compared to the left spring.
H22A4.... Where did you find this info on the lift difference and why would they build in different lifts (assuming the frame mounts are symetrical)? I really like the way your car sits and am looking for a similar stance for my 68 cuda but I had never heard of the lift difference. My OLD stock springs sit 1" lower on the passenger side already (because they are worn out :-D ). Also where did you order from that let you buy 2 left springs?