the counter weight states to use a 6 inch pad only and on the auto geek web site they state to use only a 6 inch backing plate , i thought your pad should be larger than the backing plate,please help me
They are referring to the size of the backing plate not the pads.
You can use a 5" or 6" backing plate
For 5" you can use 6" or you can go with a 6" backing platee and use the 7 1/2" pads.