Please tell me if this trim is from a 65 or 66 Dart.

cudamark said

I would use PVC pipe cut to the proper length and capped. I've seen the cardboard tubes get kinked/bent.

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Must be some pretty flimsy cardboard. I get shipments of hydraulic tubes in 20 foot cardboard from across the country, weighing over a ton. Your not crushing this cardboard. Don’t use map cardboard.