This subpart does not apply to a retention allowance authorized under 5 U.S.C. 5754 and 5 CFR part 575, subpart C, before May 1, 2005. Such allowances must continue to be paid until the retention allowance is reauthorized or terminated or until April 30, 2006, whichever comes first, subject to the regulations applicable to retention allowances before May 1, 2005. (See 5 CFR part 575 and part 530, subpart B, contained in the 5 CFR, parts 1 to 699, edition revised as of January 1, 2005.)