In the case of a covered item for which payment is made on a rental basis under section
1395m
(a) of this title and in the case of payment for oxygen under section
1395m
(a)(5) of this title, the Secretary shall establish a process by which rental agreements for the covered items and supply arrangements with oxygen suppliers entered into before the application of the competitive acquisition program under this section for the item may be continued notwithstanding this section. In the case of any such continuation, the supplier involved shall provide for appropriate servicing and replacement, as required under section
1395m
(a) of this title.