GMParts Direct states that they will ship to a PO Box if...
QUOTING:
"...your address is a PO BOX we can ship your order, unless the order is over sized or overweight, please contact customer service before placing an order to insure your order can be shipped to a PO BOX if you are unsure. This mainly applies to parts over 70lbs. or that has a length and width total over 9 ft."
Do the two springs and retainers weigh more than 70#
