Well I installed em anyway! Anyone curious to see H&R 50494-2 XI specific Springs, see below, these are installed on stock shocks, here are my comments to a comment on the link I included below:
"I measured the height, on H&R springs part# 50494-2 it sits at following:
25.5 rear (1.5 finger gap from fender)
26.2 front (2 finger gap from fender
So, there is a slight difference, however, the stock XI height (did not measure) was 2 1/2 Fingers rear & 4 fingers front so it is big improvement, might look into perches but still have to research on wether that's possible on XI + H&R Springs + Stock Shocks "
Hope that helps someone in their search.