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Dumb answer - I doubt the factory bushings would hold in there , the end is a tube , th factory arm only had approx 3/16 where it had the interference fit , the chances of the tube holding the bushing tight would be minimal
Why would you want to replace the poly?
Not on a Mopar... They don't have the step like a GM.... Press fit the whole way in... But I agree it's doubtful they are the same diameter as OE Mopar bushings.... Might contact QA-1 & ask if they offer alternative bushings...
They ride hard and tend to squeak and mixing poly with rubber is no good so if you use these uppers then you would need to replace ALL the rubber bushings in the car with Poly bushings.