Well you have OMC part numbers in the manual. Probably a Google search will answer most of your needs.
The magneto looks to be the Universal magneto used for decades. I would suggest trying to salvage the existing points (clean and polish) as replacement points (even OEM) are not the quality they used to be.
The carb too looks to be standard OMC fare; just give it a good cleaning. Maybe you will not need gaskets etc. If you decide to buy a carb kit….ABSOLUTELY get the OEM version. Many of the aftermarket varieties are absolute garbage.
The water pump just go by the OMC part numbers.