What are the verses one reads to fulfill the Sephardic custom of Avram Siz?
Avram Siz (or Avraham Zaqein) is the Sephardic custom of reading a passage in Genesis the Shabbat following a wedding.
The Arukh (under Chatan) mentions reading 3 verses (ie. Genesis 24:1-3). The Tashbetz (2:39) says the local custom near him is like the Arukh.
The Avudarham (at the end of the Laws of Wedding Blessings) citing Rav Sa'adya Gaon's Siddur (though I can't find it there) writes to recite until "MiSham" (ie. Genesis 24:1-7). The Magen Avraham (144 sk 5) and Kaf HaChayim (144 sk 10) cite this version as well. Berit Kehuna cites that practice as the custom in Djerba.
The Tikkun Yissakhar posits that the remainder of the Parsha is not read since it is only a Minhag.
This modern rendition of the section on Youtube contains Genesis 24:1-7.
This site mentions:
the Avram Siz includes the reading of a passage in Genesis in which Abraham sends his servant, Eliezer, to find a suitable mate for his son, Isaac. This is why it's called the "Avram Siz," which is Aramaic for "Avram was old," which are the words that introduce this Torah passage, which is read not in Hebrew, but in Aramaic, the language of the Targum, the Aramaic translation of the Torah.
It seems, then, that all of Breishit 24 is meant as that entire chapter deals with Eliezer finding a wife for Yitzhak.