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Old 06-09-2007, 07:49 AM
Hotrod46 Hotrod46 is offline
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Look at the caliper. After about 78 GM switched to the Metric front end on their B bodies.

Here is a picture of the metric caliper. If yours doesn't look like this then you have the older front end. If you do have a metric, just get rotors for the 81 and they should fit.
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