I believe the running hardware for the Dauntless is the same as the Donzi...However I would verify with Dumas.

This is the running hardware kit for the Dumas Dauntless 49.5" and the
American Enterprise 52". This is a twin rudder, twin solid shaft drive for two
6 volt motors. Includes:
2 #2702 Drive shaft (stainless steel, 3/16"x16", threaded 10-32 at one end)
2 #2803 Stuffing box (brass, with oilite bearings, 7.25" long for 3/16" shaft)
2 #3518 Rudder assembly (stainless steel, rudder is 3" long, 5.25" total)
1 #3504 Rudder arm (metal, for 1/8" shaft)
1 #3515 Double rudder arm (metal, bellcrank style, for 1/8" shaft)
2 #3317 Strut assembly (cast aluminum, for 3/16" shafts)
2 #7013 Drive dogs (brass, threaded 10-32)
2 #7017 Locking prop nut (threaded 10-32)
2 #7016 Thrust washer (nylon, for 3/16" shaft)
Screws, nuts, bolts and washers for assembly
Instructions for assembly.

Requires 2 motors (or two 3.5cc inboard engines), motor (engine) couplings
and left and right props.