<VV> Muffler Heat Shields

[Vairtec Corporation]

To the best of my knowledge, there exist three variations of a 
factory muffler heat shield for the Corvair:  An early model variant, 
a late model variant, and a left-side variant for the 140-hp engines.

Of the first two, one of them is a rectangle while the other is a 
trapezium.  I can't remember which is the EM and which is the LM.

Actually, there are lots of things I can't remember these days, but 
for the moment I need this piece of information to correctly identify a part.

--Bob Marlow