Drill hole in front spring hanger

YoungBlood said
Did you buy the XHD's from mancini?

If so, they recommended I buy their hanger:

Mancini A-Body Dual Location #MREAR0077.....$67.95

This hanger has the correct size holes for what you're trying to do.

No, I got them from National Moparts here in Canada,who makes them for them I dont know.