We used a folded towel for both Grandkids under the seats and NEVER NEVER had any issues with the leather.

 

Thanks for all the ideas....

I also read that the middle seat in the rear is the safest for a baby seat ...but the 450h doesn't have the ISO fixings in the middle - only the outer rear seats ?

 

When my boys were in car seats .... many, many years ago .... I went to the auto store and bought seat cusions/pads and put the car seats on top of those. They're the kind people buy to put in their drivers seat and have about 1" of foam cushion wrapped in velour, patterned cloth, etc. You can get them in all colors, they have tall back or short back, and are only as wide as a drivers bucket seat so it should cover the other seat belt clips too much. They're also made so that they don't slip. I especially like them because when you change to front facing seats some car seats have platic that may dent the back part also. Oh, and they were also great for catching all the crumbs. Hope this helps.