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Hi Paul,
        I believe one is plastic and the other is aluminum.  Bought them
both and never installed the plastic ones.  I used the Van's NACA ramp to
feed the 1" eye ball and it provides lots of air.
Jim
writes:
> <europa@pstewart.f2s.com>
> 
> Anyone know what the difference is between the eyeball vents sold by 
> 
> aircraft spruce? They have two aliminium swivel vents one at $55.50 
> (pn 
> 05-00779) and the other at $172.95! (pn 13-03600). Unfortunately 
> there 
> is only a picture of  the cheaper one on their web site.
> 
> Regards
> 
> Paul Stewart  G-GIDY
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