Does anyone know the size of the screw in blade ssd on 2012 27"imac

Using an adapter I was able to install a non-blade regular SSD in my late 2012 27" iMac and now have dual internal drives. The adapter fits into the space a blade SSD would be in, but it didn't come with the

screw to hold it in. I used double faced tape to hold it, but a year later am now having an issue and must open up the iMac again. Figured, as long as its going to be open, may as well get the correct hold down.

Does anyone know the size of the screw in both diameter and length and the thread? I saw one reference that said it's a Torx t-5, but don't know if that refers to the other dimensions.

Any help is much appreciated.