IMac 21.5" A1418. iMac 21.5". iMac18,1 Mid 2017: MMQA2LL/A (2.3 GHz Core i5). iMac18,1 Mid 2017: MHK03LL/A (2.3 GHz Core i5). Parts, tools, and supplies from Beetstech. This set of two screws can be used to secure either the left or right speaker.
eBay