Okla. Stat. tit. 68 § 2891
On or before January 1st of each year, the Oklahoma Tax Commission shall prescribe suitable blank forms to be used by all claimants for homestead exemption. Such forms shall contain provisions for the showing of all information which the Oklahoma Tax Commission may deem necessary to enable the proper county officials to determine whether each claim for exemption should be allowed. It shall be the duty of the county assessor of each county in this state to furnish such forms, upon request, to each person desiring to make application for homestead exemption on property located within that county. The forms so prescribed shall be used uniformly throughout the state and no application for exemption shall be allowed unless the applicant uses the regularly prescribed form in making his or her application.
Okla. Stat. tit. 68, § 2891