jbaakko
Diesel Detail Freak
Jerome, & Jim. They'd be more likely to use a lift spacer, similar to what you used, though it'll rarely if ever be a box like that (more likely to break). Usually it'll be a single rod/beam.
This one is upside down, for two cranes to lift one item, but it can be used the other way too.
http://www.northwestcraneservice.com/Portals/0/two%20crane%20derrick%204.JPG
Some more:
http://www.liftandaccess.com/images/article/GeneralCraneUSA-3_big.jpg
http://www.sbcmag.info/past/2004/04mar/images/12---new-device-lift3lg.jpg
http://www.audubonpark.ocps.net/Old%20Website/Pictures/DSC02965.JPG
This one is upside down, for two cranes to lift one item, but it can be used the other way too.
http://www.northwestcraneservice.com/Portals/0/two%20crane%20derrick%204.JPG
Some more:
http://www.liftandaccess.com/images/article/GeneralCraneUSA-3_big.jpg
http://www.sbcmag.info/past/2004/04mar/images/12---new-device-lift3lg.jpg
http://www.audubonpark.ocps.net/Old%20Website/Pictures/DSC02965.JPG