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The G Series (floating yoke) offers a separate yoke that moves in the pocket, as opposed to the entire unit in a rigid yoke application. The ASF-Keystone G Series are available in 10-, 15- or 18-inch travel for new-car application and replacement of existing units. These units are available in either M921B or M921D preload versions. ASF-Keystone has achieved ISO 9001 quality certification at both of its manufacturing facilities.