You may want to look at this review: NoteBookCheck.Net - Acer Aspire S7-392 review.

The SSD Acer is using in this model is a 256GB mSATA unit made by Kingston.

So if we check the Kingston web site we find this drive: SSDNow mS200 Drive.

While I can't be 100% sure here, I think you can use the Kingston drive. Why don't you give them a call to double check, I'm sure they can help you. Let us know what you find out.

Make sure you make a full backup and review Acer's info on restoring your OS on the new drive before you alter anything.