Abu Dawud said: He is Abu Abdullah, the freed slave of the Banu Taym ibn Murrah.

154 — Narrated to us Ali ibn al-Husayn al-Darhami, narrated to us Ibn Dawud, from Bukayr ibn Amir, from Abu Zur'ah ibn Amr ibn Jarir:
That Jarir urinated, then performed ablution and wiped over his leather socks, and said: "What prevents me from wiping, when I have seen the Messenger of Allah, peace and blessings be upon him, wipe?" They said: "That was only before the revelation of al-Ma'idah." He said: "I did not embrace Islam except after the revelation of al-Ma'idah."(1)

155 — Narrated to us Musaddad and Ahmad ibn Abi Shu'ayb al-Harrani, both said: narrated to us Waki', narrated to us Dalham ibn Salih, from Hujayr ibn Abdullah, from Ibn Buraydah.

(1) The hadith is authentic, but this chain is weak due to the weakness of Bukayr ibn Amir — who is al-Bajali al-Kufi — and the preserved version of his statement, "I did not embrace Islam except after the revelation of al-Ma'idah," is that it is the words of one of the narrators, not the words of Jarir himself.
Ibn Dawud: he is Abdullah ibn Dawud al-Khuraybi.
It is in "Sharh Mushkil al-Athar" (2494) via the chain of Bukayr ibn Amir, with this isnad.
It was also recorded by al-Tirmidhi (94) via the chain of Shahr ibn Hawshab, from Jarir, and he mentioned in it Jarir's statement: "I did not embrace Islam except after al-Ma'idah," and Shahr ibn Hawshab is weak.
It was also recorded by al-Bukhari (387), Muslim (272), al-Tirmidhi (93), al-Nasa'i in "al-Kubra" (120), and Ibn Majah (542) via the chain of Ibrahim al-Nakha'i, from Hammam ibn al-Harith, from Jarir: that he urinated, then performed ablution and wiped over his socks, and said: "I saw the Messenger of Allah, peace and blessings be upon him, do it." Ibrahim al-Nakha'i said: They used to admire — and in some narrations: the companions of Ibn Mas'ud used to admire — this hadith, because Jarir's embrace of Islam was after the revelation of al-Ma'idah. We say: Their concern with confirming the wiping after the revelation of Surat al-Ma'idah was to refute the assumption that it was abrogated by the verse of ablution in Surat al-Ma'idah.
It is in "Musnad Ahmad" (19168) and "Sahih Ibn Hibban" (1335).