If I recall, there are 3 different front straps and 2 rear ones with power steering, not including tripower or manual steering. If you don't match the correct year front with the rear you will have strap alignment issues. There are 2 installed straps to minimize vibration problems, mainly fatigue cracking of mounting parts. 70 A, G, & B cars simplified it with the one big "hand" bracket that covered the alternator. 71+ used completely different set. Most engineers are pretty smart and know what they are doing and why.
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