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_37 (car_numbers VARCHAR, first_used VARCHAR)

### Question ###
Which Car numbers have a First used of currently on order?

### Accurate SQL ###

SELECT car_numbers FROM table_name_37 WHERE first_used = "currently on order"