Okla. Stat. tit. 12A, § 12A-2-311: Options and Cooperation Respecting Performance

(1) An agreement for sale which is otherwise sufficiently

definite (subsection (3) of Section 2-204) to be a contract is not

made invalid by the fact that it leaves particulars of performance

to be specified by one of the parties. Any such specification must

be made in good faith and within limits set by commercial

reasonableness.

(2) Unless otherwise agreed specifications relating to

assortment of the goods are at the buyer's option and except as

otherwise provided in subsections (1) (c) and (3) of Section 2-319

specifications or arrangements relating to shipment are at the

seller's option.

(3) Where such specification would materially affect the other

party's performance but is not seasonably made or where one party's

co-operation is necessary to the agreed performance of the other but

is not seasonably forthcoming, the other party in addition to all

other remedies

(a) is excused for any resulting delay in his own

performance; and

(b) may also either proceed to perform in any reasonable

manner or after the time for a material part of his own performance

treat the failure to specify or to cooperate as a breach by failure

to deliver or accept the goods.