Plymouth duster rear suspension questions

The Hotchkiss hangers are for the stock spring location. They are also “geometry correcting” or basically a lowering hanger. The advertised 1” drop with those springs basically comes entirely from the front hanger, the spring geometry is basically a zero arch spring. More than a few people have found that with the lowering front hanger the cars end up too low and run stock hangers with them.

So short answer is yes, you’ll end up with two sets of brand new hangers if you buy the Hotchkis spring and the DoctorDiff offset kit. But they’re not the same, and if you want to run the biggest tires possible you’ll need the offset hangers.

The MP oval track springs used to be a great option. Affordable, right spring rate, zero arch and decent quality. Unfortunately MP’s quality has gone to hell, and they really aren’t a good option anymore. I have a set I haven’t installed yet but even just looking at them the quality and the way they’re arched and put together isn’t good. Maybe that’ll change again, but you’d be betting on them being different than they’ve been recently.

Eatons used to be great too, but @autoxcuda had a story about a set of those recently that seemed to indicate that their quality wasn’t good anymore either.