Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_68 (fleet_numbers VARCHAR, diagram VARCHAR, built VARCHAR)

### Question ###
What fleet  numbers have a diagram less than 99 and built in 1960?

### Accurate SQL ###

SELECT fleet_numbers FROM table_name_68 WHERE diagram < 99 AND built = "1960"