Vendo 570 Vs. Vmax 570

[mvideo]

Hi, I recently purchased a Vendo soda machine marked V570D . How do I tell if it is a Vmax model? Apparently the shims I need to convert it from 20oz bottles to 12oz cans are different on the two models. Any help would be greatly appreciated. 

Thanks

[AZVendor]

I think that's a Univendor2 machine.  The Vmax has grey motor cams while the Univendor2 has blue and/or green cams.  The Univendor has black cams.  Anything older is far different than these 3 generations.