Heytrack were the original importers of Canam from 75 until 78 but they weren't importing much after late 76. TnT's, O/R's and some 77 Quals (not sure about any MX3's). Floods took over from there with the orange tankers and Qual 3 and 4.
During this period there was a branding issue where Repco  had registered the Canam name resulting in the bikes being sold under the Bombardier logo.
The models ran -
1973/4  TnT & MX1
1975   TnT
1976  TnT, MX2,O/R
1977  TnT,Qualifier,MX3
1978  MX4, Qualifier
1979  MX5, Qualifier
1980  MX6, Qualifier
1981  MX6B, Qualifier
1982  Qualifier4
Hope this helps the curious. There are other models not included here but this covers the models we saw.