Dr Amar Hasan Sabri in “Zawaid Abdullah ibn Ahmad ibn Hanbal fi Musnad” (p 400-401):
It was narrated to me by Abu Muamar from ibn Abu Hazim, which said: A man came to Ali ibn al-Husayn and asked him: What was a place of Abu Bakr and Umar in (the eyes) of prophet (sallalahu alaihi wa ala alihi wa sallam)? Imam answered: “The same as in this hour” (1).Chain is broken, and narrators are thiqat.
Ali ibn al-Husayn that’s Zaynalabidin famous follower (tabein). And ibn Abu Hazim that’s Abdulaziz ibn Abu Hazim Salamah ibn Dinar, and he was thiqat but he didn’t reached Ali ibn al-Husayn, and Abu Muamar that’s Ismail ibn Ibrahim ibn Muamar.
This report was transmitted by Abdullah in “Zawaid Fadailus Sahaba” (223) and in “Zawaidu Zuhd” (2/17) with the same chain and text.
al-Heythami in “Majmau zawaid” 9/45 said: Narrated Abdullah and I don’t know ibn Abu Hazim, shaykh of Abdullah was thiqat.
Muhaqiq of “Fadailus Sahaba” said: This report present in the “Fadailus Sahaba” of Daraqutni from ibn Abu Hazim from his father and this chain is connected and authentic
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1) They are buried together.