I myself own no Mohawks, but have seen a few different rear (and front for that matter) site arrangements. The proper one is the same as the 788 rear site but with the shorter overall ramp. Some 788s have a longer ramp but no options are shown in the parts listing I have. All totaled, there are about 8 pieces that make up the whole thing. Rear sites may interchange but the height may be off due to barrel configuration and length. Model Seven sites are fairly unique and won't be proper.
The front site ramp is similar to but not the same as the 700. The Mohawk shares the same front site ramp as the 660,760,6,4, and 7600. The 700 may fit, but height still plays a part in proper alignment.