Best way is to cut out an enclosure from a sheet of foam. Not very soft foam but slightly hard and about half an inch thick. Then pack it in a box filled with foam peanuts.
Other option is to wrap it in bubble wrap, preferably with larger bubbes, not the type u burst with one finger. But im not sure if thats available easily. With regular bubble wrap just wrap it with about an inch thickness and then box it tightly with foam peanuts for extra protection.
Ive had quite a few vendors in the States ship me OEM drives with the above packaging. Never had trouble with any of them.