Any dealer who wishes to post a sign other than the one supplied by the Department may do so, provided that the sign so substituted is approved by the Commissioner prior to its posting. To be approved, substitute signs shall be at least eleven inches by seventeen inches in size and shall contain language that is similar in import to that required by 6 RCNY § 5-192. Dealers may expand upon, but may not omit, any of the language required by 6 RCNY § 5-192. To obtain prior approval for a substitute sign, a dealer shall submit to the Department a true representation of the sign for which approval is being sought. The type for the heading on substitute signs shall not be smaller than three quarters (3/4) of an inch in size. The type for the text on substitute signs shall not be smaller than one half (l/2) of an inch in size.