Hellwig 5905 sway bar install troubles 74 duster

Trying to install the hellwig 5905 1 1/8 in solid sway bar in my 74 plymouth duster with factory sway bar lower control arms. Seems like the bar mounts up too high and makes contact with the inside top portion of the k member. And when trying to mount the ends to the lower control arms the bolts aren't long enough for the top washer and nut. The sway bar seems to be facing the correct direction. Anyone else ever have any trouble installing one of these?
Food for thought, but it looks like some 1/2 inch spacers would do the trick.