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There are # of people looking for them so you might be in a long line. Ebay has them every so often. The "Castus Smasher" as they call them on early Bronco's looks like the full size truck one, but it will NOT fit.
When I say "Early Bronco" I mean 66-77 pre Bronco II. And that one will NOT fit.... like I said. People find it on the web for sale and think it will fit.
And yes the one off the 78/79 Bronco will fit a 78/79 F150 F250.
So FordC mike make them, the hard part is the 90 bend on the bottom without bunching the pipe.
Here is a fellow FTE members take on reproducing them. "I took some measurements today while I had my tape measure out. it's 2" O.D. tube. The main hoop is just under 6 feet long, believe it or not. The cross bar is 32" long. They don't look that big, do they? The cross bar is 24 inches plus about half the bend radius on each side or 7 inches. Therefore, 32 inches is about right.
Based on my calcs, these are the bends based on a 7-inch radius:
Desired project dimensions:
Length #1 = 18 inches (angled upright) Angle #1 = 82°
Length #2 = 24 inches (crossbar) Angle #2 = 82°
Length #3 = 18 inches (angled upright)
Calculated straight tube dimensions:
Bend Mark #1 = 12.90 inches Angle #1 = 82°
Bend Mark #2 = 34.75 inches Angle #2 = 82°
Cut Off Mark = 57.70 inches
I recommend bending the main hoop first and then the bends at the lower mounts last. They aren't as critical. Therefore, increase the lengths above by enough so the bender has something to hold on to. I figure it'll take at least an 8-foot length of tube.
Before releasing the tube, measure the outside spread along the tube where it will be bent back to meet the bumper. The tubing center lines should be about 3.5 to 4 inches more than the measurement between the lower bumper mounting bolts."
HIO Silver just posted a great measurement pic, I am looking for it.