There are different answers to the question depending on what you are wanting to achieve:
a) a stock of the parts you should carry in the car because they are liable to fail without warning, but totally disabling if they do (spark plugs, fan belt, fuel pump relay, Ignition Amplifier Module, Crank Position Sensor). They range from easy to slightly difficult to swap at the roadside, but are still readily available from suppliers
b) a stock of parts you reasonably believe are going to become unobtainable and you might well want in a few years time. It would be useful to know what effect panic buying has on the manufacturers - do they see the increased demand so increase production, or does it simply exhaust the limited supply more quickly so that other enthusiasts miss out?
c) a stock of the bits which you know wear out slowly, and are annoying if you suddenly need for an MOT. For example I always keep a spare pair of rear reaction rods with new bushes fitted. They only last about 40,000 miles in my experience, are easy to swap onto the car, but are hard work removing and refitting the bushes.
The lists in each category are potentially endless, and depend on one's abilities. Also spares availability changes, so you have to keep abreast of trends.
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