Here's a couple pics of the muffler bracket on my '51 3100. It's riveted to the crossmember and has a curved portion to fit the muffler with a strap and tightening bolt around the muffler.
The Filling Station sells a replacement HERE but it says it attaches to the frame rail. It doesn't look exactly like my original, but would probably work. You'd need a strap and draw bolt to go with it.
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Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.