I just got done installing the hollow tube Hellwig. No problems with fitment at all. Small dip to bottom. Had to drill the holes and mount the tabs for end link. Nothing even near hitting it on steering lock to lock.
Haven't driven it yet, so hot out and am inside cooling off. But it looks like it will work just fine. So far, I'd recommend to anyone.
Mine is for the 74 Duster. 55905 part number.