Why would you need ot replace the cam way ? Just as an upgrade ? Typically the top covers are replaced as a unit - there may be info in one of the TMs If you send me an email or PM I can send you digital copies of the TMs I have - most are not for the current E4 / E6. you might give Desert Ordnance a call and see what they could tell you .
I am putting a top cover together for an E1 and have two cams, one does not have the extra spring and one with the spring. I didn't know if the one with the spring is for a later model or would work with standard E1 parts.
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