Kato RS-2 shell on older Atlas/Kato RS-3 chassis?

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I have a couple of older Atlas/Kato RS-3's that are smooth runners but have molded on grabs, and need repainting. I see a couple of newer Kato RS-2 shells are available on eBay. This would be an easy "fix" IF they fit.

Does anyone know if the new Kato units sit on the same chassis? If they are a drop-on, with no mods required, I'd like to know!

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