The tradition mentioned above has also been transmitted by Qais bin Al Harith through a different chain of narrators to the same effect.
Sunan Abi Dawud Book 13, Hadith 68
← Previous Hadith I embraced Islam while I had eight wives. So I mentioned it to the Prophet (ﷺ). The Prophet (said) said: Select four of them.

Abu Dawud said: This tradition has also been narrated to us by Ahmad b. Ibrahim from Hushaim. He said: Qais b. al-Harith instead of al-Harith b. Qais. Ahmad b. Ibrahim said: This is correct, i.e. Qais b. al-Harith.

Sunan Abi Dawud Book 13, Hadith 67 Next Hadith → I said: Messenger of Allah, I have embraced Islam and two sisters are my wives. He said: Divorce any one of them you wish.

Sunan Abi Dawud Book 13, Hadith 69