last two. ran into issue with the leaf spring front bushings. Too large diameter. Supplier said the small diameter are for Hemi springs. I know the history of the car and doubt they were upgraded. Change they were out of standard and threw a set of Hemi springs under it during build?

How else are hemi springs different?

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'70 Challenger R/T 383
'16 Hemi Durango SSV (work vehicle)
'15 Ram Police SSV