How to tell the version of VPI JMW tone arm?

I bought a VPI Aries 1 with JMW Memorial tone arm. But there is no version marker on the tone arm. I don't know it is 9", 10" or 10.5". There is a serial number 97-741 on the arm. Can someone tell me which version the arm is? Thank you.
Dear Cygnus: Here you can define ( in the chart ) which model you own. The other alternative is to email directly to VPI.

Thank's and best regards.