Where to get pre bent exhaust pipes and any suggestions on how to swage them to fit over mufflers?

I bought the kit from Jegs for my '74 360 Duster. Had to trim and fit every single piece, but now it's all welded rather than clamped. I also bought 2 sets of flanges and put them at the front of my mufflers, so I can drop out the mid section if I want, as the H pipe is under the trans tail housing. Yeah, it was way more work than I expected.

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