Maryland Code, Commercial Law § 12-608

(1) The seller is not required to deliver a copy of the installment sale agreement to him;

(2) If the installment sale agreement received by the seller from the buyer contains blank spaces to be filled in or corrections to be made, the seller may insert or correct in the appropriate blank spaces the amounts of money and other terms set forth in the seller's catalog then in effect; and

(3) Instead of the copy of the installment sale agreement required by § 12-605 of this subtitle, the seller shall furnish to the buyer, within 15 days from the date of shipment of the goods, a written statement of the items inserted in the blank spaces.