small windscreen for racing

[steven boortz <vociferouschicanery@yahoo.com>]

hi everyone
in preparation for another track day in my roadster (06/09 and 06/10 at 
Buttonwillow), i have removed the windshield on my 67.5.  it has become an 
almost exclusive track car.  my question is about the low windscreens i see 
which replace the windshield on race cars.  are those owner-fabricated?  or 
does someone actually sell something to bolt on?  any info is greatly 
appreciated.
thank you
steve
675MIZU