To the best of my knowledge, the larger bushing OD was implemented in 74. Your 73 should have the smaller bushings and bolts. Sounds like GW may have the story correct and your car was updated with later parts. Possibly damaged a subframe in an accident and replaced it with a complete one from a 74?
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Bob Woodard
Brighton, MI
2012 SRT8 Charger - 12.70 @ 111mph
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