The instruments are the same size as the same era F body. The two larger pods are 4 1/2" and the small one is 2 1/16". Do a search in the F body forums for aftermarket gauges that fit the stock openings. The downside to the A body dash versus the F body dash is there are fewer places in the dash cluster to mounts all of the aftermarket gauges you will need. That's why the OEM Rally cluster jammed the oil pressure, fuel, and temp in the center pod, and deleted the voltmeter in favor of the GEN lamp in the tach/clock.
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1976 LeMans B09 Freeway Enforcer, 455/M40 Smokey
1977 Trans Am, 400/M21 Black/Gold Bandit. 44K actual miles
2017 Sierra SLT 1500 Z71 4X4 
2019 Canyon SLT Crew 4X4 
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