(b) If such employee, widow or widower is receiving the statutory maximum benefit in effect at the time of the accidental injury or death, the supplemental benefit shall be an amount which, when added to the regular benefit established for the case, shall equal the maximum weekly benefit in effect for a permanently totally disabled employee, widow or widower whose claim arose on January first, nineteen hundred seventy-nine.

(c) If such employee, widow or widower is receiving a weekly benefit which is less than the statutory maximum benefit which was in effect on the date of the accidental injury or death, the supplemental benefit shall be an amount equal to the difference between the regular benefit being received and a percentage of the maximum benefit in effect on January first, nineteen hundred seventy-nine, determined by multiplying the latter benefit by a fraction, the numerator of which is the regular benefit and the denominator of which is the statutory maximum benefit in effect at the time of the accidental injury or death.

(d) In the event the supplemental benefit computed under this subdivision amounts to less than five dollars, then the supplemental benefit allowed shall be a minimum of five dollars, less the amount, if any, by which the combination of such supplemental benefit and the regular benefit exceeds the maximum weekly benefit in effect for a permanently totally disabled employee, widow or widower whose claim arose on January first, nineteen hundred seventy-nine.

(e) The employer or his insurance carrier paying the supplemental benefits required under this subdivision shall claim reimbursement for each such case from the reopened cases fund under this section, commencing one year from the date of the first such payment and annually thereafter while such supplemental payments continued, on a form prescribed by the chairman.

(f) The special disability fund created under subdivision eight of section fifteen and the reopened cases fund created under section twenty-five-a and the aggregate trust fund created under section twenty-seven of this chapter shall be deemed to be insurance carriers for purposes of this subdivision, other than the payment of the assessment under the provisions of subdivision three of this section.

(g) Whenever payment of the supplemental benefits prescribed hereunder is not made by the insurance carrier by reason of the insolvency of such insurance carrier, or in the case of a self-insurer, by reason of the insolvency of such self-insurer or the discontinuance of its operations, such payment shall be made directly out of the reopened cases fund under this section by the commissioner of taxation and finance upon vouchers approved by the chairman of the workmen's compensation board.