Oregon Revised Statutes Commercial Transactions § 83.530

(a) If delivery of the motor vehicle is not made at the time of execution, the identifying numbers or marks of the motor vehicle or similar information and the due date of the first installment may be inserted in the contract on or about the date of delivery.

(b) If the name of the financing agency is not known at the time the contract is executed, the name of the financing agency may be inserted in the contract on or about the date the name of the financing agency is known.