These rubber stoppers are used in different places in the various VW models, often as sealing plugs and in some cases also as impact rubber. In the overview below, this is elaborated per VW model. If you want to use them for another purpose, e.g. as a tectyl cap, keep in mind that they are made for an 8 mm hole with a sheet thickness of 1 mm.
Beetle:
all construction years: rear panel (2 pieces)
from 8/1964 : engine cooling valve shock rubber (2 pieces) sedan
from 8/1967: in the front bulkhead (1 piece)
convertible from 8/1967 to 7/1970 (1 piece)
from 8/1967 : in the fuel filler tank (1 piece)
from 8/1967: outer steering rod sleeve (1 piece)
up to 7/1965 : wheel hub caps ¹ (16 pieces)
up to 7/1959 : headlight housing (4 pieces)
Karmann Ghia:
from 8/1964: engine cooling valve shock rubber (2 pieces)
from 8/1960 : rear spare wheel body (1 piece)
from 8/1967: outer steering rod sleeve
(1 piece) to 7/1965: wheel hub caps (16 pieces)
Type 3:
all construction years: rear mudguard edge (2 pieces)
Bus:
up to 7/1970: wheel hub caps (16 pieces)
from 8/1967 to 7/1979: in the rear corners (under the tail light) (2 pieces)
from 8/1967 to 7/1979 : in the floor for the rear wheels ² (alternating)
from 8/1964 and after: engine cooling valve shock rubber Type 1 engines (2 pieces)
Kübel:
all construction years: engine cooling valve shock rubber (2 pieces)
* is the total number required for the functions listed, are provided in pairs
¹ has only been used with original hubcaps delivered ex-works, is rare
² has been applied as a so-called tectyl cap when no fixed number has been used, look at the situation and order the required number
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