1. A plan of conversion shall include all of the following:

 a. The proposed articles of incorporation and bylaws of the mutual insurer as a stock company.
 b. The manner of treating a holder of a surplus note agreement, if any. The holder of a surplus note agreement, if otherwise qualified, may, at its option, exchange the agreement for an equitable share of the securities or other consideration, or both, of the corporation into which the insurer is to be converted.
 c. The manner and basis of exchanging the rights of each voting policyholder and each eligible policyholder of the mutual insurer to be converted to a stock company pursuant to this chapter. Such exchange may include a base value for each voting policyholder in recognition of the voting policyholder’s voting rights as a mutual policyholder as well as consideration to be provided to each eligible policyholder in exchange for the eligible policyholder’s rights as a mutual policyholder of the mutual insurer to be converted. After determining the base value to be provided to each voting policyholder in recognition of the voting rights of the voting policyholder, the equitable share of each eligible policyholder in the remaining statutory surplus of the mutual insurer, plus any adjustments for nonadmitted assets or additional value permitted by the commissioner, to be provided to each eligible policyholder shall be determined by the ratio which the net earned premiums the eligible policyholder has properly and timely paid to the mutual insurer on insurance policies in effect during the three-year period immediately preceding the adoption of the plan of conversion, including the date of the adoption of the plan of conversion, bears to the total net earned premiums received by the mutual insurer from all eligible policyholders during that three-year period. The base value to be provided to each voting policyholder in recognition of voting rights and the equitable share of each eligible policyholder may be exchanged, without additional payment, for securities or other consideration, or both, of the stock corporation or an affiliate into which the mutual insurer is to be converted. If the base value for each voting policyholder or the equitable share of each eligible policyholder entitles the policyholder to the purchase of a fractional share of stock, the policyholder has the option to receive the value of the fractional share in cash or purchase a full share by paying the balance in cash. However, policyholders due a de minimis amount, as established by the commissioner, need not be offered the value of the fractional share or the option to purchase a full share. The plan shall also provide for the disposition of any unclaimed shares.
 d. The number of voting common shares proposed to be authorized for the stock corporation, their par value, and the price at which they shall be offered.
 2. A plan of conversion for an insurer organized on the mutual plan under chapter 491, shall also provide for conversion to a stock company as follows: the insurer organized on the mutual plan under chapter 491 shall amend its articles pursuant to chapter 491 as necessary to become a stock company, and shall immediately convert to a chapter 490 corporation as provided in section 490.1801 upon becoming a stock company.