No. those are 15mm high. you can only fit one. The original dual drive setups (server model) had 2x 9.5mm high drives
Now according to Hede above you can, fit a 7mm SSD drive in the space remaining after installing a 15mm high drive. My theory as to why he said the 7mm drive has be a SSD and not HDD is that since 15+7mm = 22mm and the original server setup was only 19mm of drives, the second drive has to sit on the first one, without any dead space in between separating them. If both are HDD (spinning, mechanical), then vibration... though small.. would get shared between drives and that could cause havok on the life of the drives. A SSD has no moving parts and shoudn't be affected by minor vibration.