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Don't know much about E bodies, but I can tell you that super stock springs have a 20" front segment, same as factory A body. In a B body car you need to order a longer front perch to compensate for shorter front segment. I can only assume it would be the same for the challenger, but Mancini could answer that question with one phone call. Good luck, JP.

'65-up b and all E have 22" front segment so will need the 2" extended hanger to use superstock springs with a 20" front segment.