These are some sort of caps, I tired to install the metal tube extensions
for the air hoses and even a little sledge hammer wouldn't do the trick, I
started to look at a bug exahst and didn't see that little round hole in the
center so I deteremed those caps could be removed.  A pry with a heafty
screw driver and they came flying out, the old extentions dropped right
in...We had some new ones and they didn't fit.

>
>An oddness about the muffler is the fresh air inlet connection.  The
>old one had a tube on each side that stuck up through the engine tin,
>that you'd slide the air hose onto.  The new ones (apparently Danish
>from the labels on them, although the invoice and catalog both claim
>them to be German) have this kinda funky flanged thing instead of a
>hole for the tubes.  A side view looks something like:
>
>      _                          _
>       \                        /
>        |                      |
>        |                      |
>        +------          ------+
>        |                      |
>
>The diameter of the || parts is almost identical to the fresh air
>hoses (i.e., you can get the end of the hose into the flange, but no
>farther).  There's a flat plate with a hole in the middle of it a
>little ways in, which appears to restrict the flow to about one third
>of what it would otherwise be.  I suspect I did not get a normal
>bug/bus muffler, although it was sold as being for VWs from 1963 until
>sometime after 1971 (the catalog's not at hand at the moment, so I
>don't know the cutoff date, but it's definitely after 1971).  I ended
>up using some metal-ribbed rubber dryer hose and a clamp to hold it on
>there.  It's going to make life interesting the next time the fan belt
>decides to go on walk-about, and take the hoses with it.  Any ideas
>what this sort of connector is meant to connect to?
>
-
http://www.wolfenet.com/~hoomon
The man in the 11 window Split!