(2) Unless otherwise agreed specifications relating to assortment of the goods are at the buyer’s option and except as otherwise provided in ORS 72.3190 (1)(c) and 72.3190 (3) 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 cooperation 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 the performance of that party; and
(b) May also either proceed to perform in any reasonable manner or after the time for a material part of the performance of that party treat the failure to specify or to cooperate as a breach by failure to deliver or accept the goods. [1961 c.726 §72.3110]