You can convert pickup truck bench springs to fit the Burb. seats but, it is not as easy as you think.
The seat frames must be completely disassembled to their component parts.
The lower frames & X members need to be re-sized.
The coil supports must be modified.
The coils must be shortened.
And the top wrap around rod must be fabricated.
Then comes the task of assembling everything back together.
Not very easy to do.... but... not impossible to do.
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