Very creative 
A friend of mine once worked at a plastics company Link below. If the heat doesn't work out to your satisfaction
they have clear balls that could be cut in half to fit your needs...
I prefer the bragging rights of the DIY o good luck to ya.
BALLS PLASTIC BALLS FROM COMPLEX PLASTICS 1-888-PLASTIK 1-800-363-2870 SUPPLIERS OF INDUSTRIAL PLASTICS
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2012 Chevrolet Traverse *active*
2002 Oldsmobile Alero GLS *active*
2002 S10 2wd p/u 139,000mi. *active*
1975 Corvette Stingray *active*
1994 Camaro Z28 Convertible 149k *Sold 2013*
1998 Blazer ZR2 189k *Sold 2012*
1995 Tahoe LT 250k *Sold 2011*
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