Okla. Stat. tit. 14A, § 14A-2-308: Assumption

If a seller expressly agrees in writing with a subsequent buyer

to accept that buyer as a primary obligor on an existing transaction

in which a mortgage, deed of trust, purchase money security interest

arising under an installment sales contract, or equivalent

consensual security interest was created or retained in the original

buyer's principal dwelling to finance the acquisition or initial

construction of it, before the assumption occurs the seller shall

make new disclosures to the subsequent buyer based on the remaining

obligation. If the finance charge originally imposed on the

existing obligation was an add-on or discount finance charge, the

seller need only disclose the unpaid balance of the obligation

assumed; the total charges imposed by the seller in connection with

the assumption; the information required in the case of new

disclosures concerning prepayment, late payment, security interests

and to exclude premiums for consumer credit and property and

liability insurance from the finance charge; the annual percentage

rate originally imposed on the obligation; and the payment schedule

and total of payments based on the remaining obligation.