You'll have to build a crate. The shipping company I usually use doesn't charge by size, but weight so just build a crate around it with some 1x4's staple or tape a cut up box around it and wrap the part in 1-2 laters of bubble wrap and your good to go. Or you could just go to any place that receives alot of sdhipments and try to score some free air pack packaging to stuff around it. reguardless build a crate or use a very thick sterdy refrigerator type box.
HK
HK