These are the 2 O-rings that sit behind the prop and protect the gearbox from water ingress. Two are required.
This is a Saildrive/ Sterndrive drain plug O-ring and an oil filler O-ring on a DP-G sterndrive.
Folding hub hex screw used on a 3 or 4 blade folding hub mounted on a Saildrive or shaft. Three or four are required dependant on the number of blades present.
This is a drain plug O-ring for the 290-DP, DP-E other DP drives listed below. This is the larger option for an MS25S and some 120S-E Saildrives whereas the other option, part number 3855081 is a much smaller O-ring measuring about 6-7mm.