As I'm not sure what model GG your talking about I wouldn't know what 320mm bracket you would need. In fitting the 320 rotor to the caliper you would need a specific bracket to match the fork to the caliper. Matching the rotor to the hub is one factor. The other is matching the fork to the caliper and extending it by enough to accept the 320mm rotor. In looking at jeffs bracket, it appears that the bracket just extends the components by enough to fit the larger rotor. My fork is the standard Shiver 45mm connected with a Nissen bracket to a Nissen caliper. The Motomaster bracket for that set up is different than Jeffs. My motomaster bracket part#2110036 attaches to the fork and completely replaces the standard Nissen bracket.
Depending on the fork and caliper that the CCM uses would determine whether or not their extension bracket would work with your setup.
Tony
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