The part number is printed on the cartridge you are replacing, usually along the side or on the cap. Any one of the numbers on it will work.
No match for "7042798" yet.
Check the number against the cartridge once more, as a misread 0 for an O is the usual cause.
If it is correct, email the number and your refrigerator model to Zackexclusivehub@gmail.com and we will identify the right filter for you, or source it.