Ernest,
For my 20B, I initially purchased an LS1 throttle body off ebay, which
was a tad bigger than the Mustang TB (70mm if I recall correctly).  I
accomplished the return spring mod by removing the stock LS1 spring and
replacing it with one from the Mazda TB which was wound in the opposite
direction.  I ended up not using it after all, so I can't say how it
works in the real world.  You might be able to find an appropriate
spring (wound the desired direction) from a good hardware store, or head
for the wrecking yard.  I don't think I would attempt reshaping the
Mustang spring.  

Mark S.

 
I measured the ones I have across the opening in the bottom, and it came

out to 60mm.  Did I measure it in the right place?  The intake end seems

to be slightly larger.

BTW, how did you reverse the spring?  Can you just bend them around to
the proper shape?  These springs on this
BMW throttle seem to be pretty stout.  I don't think bending them into
shape would be trivial.

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