This one is for 7060MT and good for 7070MT too.  how to install 7060 and 7070 are essentially same pc, same motherboard chipset except that Dell added 9th gen cpu support in 7070 bios.   [IMAGE]   OEM Dell Optiplex Card Reader Small Board Assembly 59MR7 for MT
Hi.  I'm looking for the SD Card Reader for the 7070 MT.  I am able to locate one for the SFF, but it is different.  This one has a high-density connector on the mother board.  
SD Card Reader for 7070 MT