The version 3 vertical motor mount is SAK-S17/PK.
It has the other side of the spur gear mount in aluminum included and the top motor mount hole arm included on a separate part that you bolt onto the main mount. All 3 pieces (the spur mount, the top hole arm, and the main vertical mount) are included in that part number.
I got mine at TQRCRacing.com
Hope this helps.