Is “Together with Yan Chengfang, Di Lei, and He Yuanqing, known as the Eight Great Hammers” true?

Shuo Yue Quanzhuan has Yue Yun sworn brothers with Yan Chengfang, Di Lei, and He Yuanqing, collectively known as the 'Eight Great Hammers', and together they cause a great uproar at Zhuxian Town. The original text reads: 「岳公子银锤摆动，严成方金锤使开，何元庆铁锤飞舞，狄雷双锤并举，一起一落，金光闪灿，寒气缤纷！这就叫做“八锤大闹朱仙镇”.」(Shuo Yue Quanzhuan, Chapter 58) Consulting the History of Song, it is known that apart from Yue Yun, the other three, Yan Chengfang, Di Lei, and He Yuanqing, have no historical records whatsoever; they are purely fictional supporting warrior characters created by the literary work to make up eight hammers and enhance the spectacle of frontline combat.