Local Government Act Article 83-5

Prior to the formulation (promulgation) of self-government laws and regulations for mountain indigenous districts, the self-government laws and regulations relevant to existing special municipalities shall apply.If a mountain indigenous township is directly converted into a mountain indigenous district and it is necessary to continue to apply the previous self-government laws and regulations, such self-government laws and regulations may continue to be applied for two (2) years after an announcement by the mountain indigenous district office.
中文原文 地方制度法第83-5條
山地原住民區之自治法規未制(訂)定前,繼續適用原直轄市自治法規之規定。
山地原住民區由山地鄉直接改制者,其自治法規有繼續適用之必要,得由山地原住民區公所公告後,繼續適用二年。

English translation for reference only; the Chinese text prevails. Not legal advice.