Okla. Stat. tit. 58, § 58-481: Contract for the purchase of lands may be sold

If a decedent, at the time of his death, was possessed of a

contract for the purchase of land, his interests in such land and

under such contracts may be sold on the application of his executor

or administrator, in the same manner as if he had died seized of

such land, and the same proceedings may be had for that purpose as

are prescribed in this article for the sale of lands of which he

died seized, except as hereinafter provided.