Here are the OD dimensions for the Series 90 Self Dumping Hoppers:
1/4 yard - 32"w x 55"l x 22"h
1/2 yard - 32"w x 55"l x 29"h
1 yard - 51"w x 55"l x 29"h
1.5 yard - 51"w x 55"l x 41"h
