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They're not really 'bumpstops' that's a sort of misnomer, but eveyone knows that is meant though.
They are called 'additional dampers' and they are there to control the end speed of the damper travel and prevent the softer factory dampers from bottoming out so easily.
These allow the car manufacturers to use the same damper across a lot of vehicles and to easily tailor the travel and end cushioning using cheap rubber collars instead of multiple costly damper variants.
The birds B3 kits for example needs NO 'bumpstops' at all as the damper has end travel protection iternally, and is much stiffer anyway so the end travel is already much slower.
AFAIK you wouldn't use any bumpstops on a decent after market kit.
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