41 CFR § 102-38.195
Must bidders use authorized bid forms?
June 9, 2020
No, bidders do not have to use authorized bid forms; however if a bidder uses his/her own bid form to submit a bid, the bid may be considered only if—
(a) The bidder accepts all the terms and conditions of the offer to sell; and
(b) Award of the bid would result in a binding contract.