The purchasers or their vendees, heirs or legal representatives who have used, occupied, and made improvements on lands prior to the date of forfeiture, and which lands have been forfeited under the provisions of Article 5326, Revised Civil Statutes of Texas as amended by said House Bill No. 56; and who shall have, within six months after the expiration of the five year limitation period provided for reinstatement in Section 3 of said House Bill No. 56, and prior to January 1, 1947, paid or tendered payment to the Commissioner of the General Land Office of all delinquent interest, accompanied by written requests for reinstatement, may have their claims reinstated by renewing such requests and paying all delinquent interest up to the date of reinstatement.