Is the buick AM/FM radio that spell out BUICK accross the preset buttons correct for 71 or the one that doesnot say buick?????
Also there is a big car and an A body size. For the correct number for your application check www. buickperformance.com
Make sure you buy the correct one for your A-body as Jim Lore stated. Read this article to id the differences: http://www.buickperformance.com/RadioLabelDecoding.htm