How to map numbers utilizing array function

I would have thought this would be simple, however, I'm having a hard time with it. I have this function and I'm having a hard time mapping numbers. I have a spreadsheet that I import with WP All Import and utilize this function for a variety of other fields that are not numbers and it works great.

In example, other fields where I use this function is for something like 'Gasoline' => 'Gas' and it maps "Gasoline" to the "Gas" category without any issues, however when using only numbers (2, 4, 6 etc) as seen below, it won't map it to the "X Passenger" category that I have in the database. I hope I'm explaining this appropriately.

Anybody have any thoughts on what I'm doing wrong? Thank you in advance.

function seating_translate_data_sample( $data ) {

    if (empty($data)) {
        echo "Not Specified";
    }

    $map = array(
        '2'  => '2 Passenger',
        '4'  => '4 Passenger',
        '6'  => '6 Passenger',
        '8'  => '8 Passenger',
        '10' => '10 Passenger',
    );

    foreach ( $map as $partial_match => $mapped_value ) {
        if ( stristr( $data, $partial_match ) ) {
            return $mapped_value;
        }
    }
    return $data;
}