I think you could use the shock tower that comes with the suspension kit used to replace the EAS on a Range Rover Classic.
Not sure if there is room in a D90 for the shock tower and you'd probably have to fab up something for the lower shock mount.
I just saw a picture of a D90 that had separate shock and spring mounts, but I can't find where it was. It was a well done custom setup.
2011 RR HSE -
1970 LR Series 2A Bugeye BenzOver
2001 GMC 2500 4wd