Dash pad questions

I have 1970 challenger, single speaker non airconditioned car with a completely wrecked vinyl top and a very rusty steel sub frame, so either need to replace or refurbish.

1. Is a 70 Challenger dash pad a 1year only deal? (I note on various sites 71-74 are bundled together but 70s are always a different part number)
2. What, if any differences are there between the steel sub frames on a cuda and challenger, are they interchangeable? (I can get a 72 cuda steel frame needing recovering...

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Author: Tony C