I used a Swissbit X-60 mSATA 60GB SSD with an Ixora v1.2A carrier board and an Apalis iMX8QM CoM. It is SATA III SSD, but SATA III devices are backward compatible with SATA II interfaces. (You can verify this by looking at its datasheet, stating it is compatible with SATA Gen2). It is also available in 8/16/30/60/120/240/480GB sizes.