SSD, SATA, 16GB, module Half 1.8"  form factor (tested with for fit-PC2/2i)

Mfg 

Mfg PN 

KingSpec
KSD-SA18.7-016MJ
KingSpec
V18-(0)16

 

SSD, SATA, 32GB, module Half 1.8"  form factor (weren’t tested on fit-PC2 but approved for use)

Mfg 

Mfg PN 

Biwin
CHF66DS1905-032
RunCore
RSE-III-S1032-MC
SanDisk
SDSA4AH-032G

 

SSD, SATA, 120GB/128GB, 2.5" (weren’t  tested on fit-PC2 but approved for use)

Mfg 

Mfg PN 

ADATA
AS510S3-120GM-C
ADATA
ASP600S3-128GM-C {ASP600SS-128GM}
ADATA
ASU800SS-128GT(-C)
MICRON
MTFDDAC128MAM-1J1
Phison
PC635021R
Silicon Power
SP120GBSS3V60S25