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SD7/9, GP7/9, and others. Designed for use with the EMD SD7/9 and GP7/9 units, this exhaust stack provides thin walls (just .01" thick!), plus all of the correct angles and dimensions of the prototype. One of the smallest and most important feature of early EMD units. This design was used on almost all early EMD hood units. N Scale (1:160). Includes 16 pieces.