Chrome was an extra-cost option. It was for every year up until they went with the Rubber Baby Buggy Bumpers in 75.
In 73, the 2.0's got them together with most of the rest of the options. The 1.7s still had to pay extra for them.
--DD
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Pelican Parts 914 Tech Support
A few pics of my car:
http://www.pelicanparts.com/gallery/Dave_Darling