My 68 Cuda Trunk Trim from Steve Clair Young

Murray said
4" pipe is too small. Need at least 6". This gets expensive. Go to shipping/packing company. I use 6x6 box, extend it for your use and re-enforce with additional boxing or wood.

Have you priced upper and lower 1968 Barracuda trunk trim lately?

Here's what it costs to replace.

Pipe is cheap and almost indestructible insurance in comparison.

https://www.classicindustries.com/product/all-years/plymouth/barracuda/parts/ma1867.html