IMSF8

Does anyone know the actual physical dimensions of the Cayman intermediate main shaft? I'm specifically interested in the overall length and the diameter and wall thickness of the shaft for the 987.1 3.4L engine. In case anyone is wondering, it's because I need to calculate the mechanical resonance frequencies. Frankly the IMS dimensions for any of the other Cayman / Boxster engines will probably be close enough for this purpose. Thanks!