From
http://fordbolts.com
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If one looks closely at available factory photos taken in
the Model A era and compares the shading of the engine fan
belt to other rubber components, etc, he can not help but
conclude that they were different colors. Fortunately we have
been able to find enough documentation, photos and NOS belts
to develop a special color agent to change your black, post-war
service (or modern replacement) fan belt to the correct brown.
B-108-P Special fan belt coloring agent (it really does the job – one $ 15.95/half pint
that normal paints can't do)
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