if the lm324 isn't surface mounted, it should be easy enough to make a
small board with surface mount parts (possibly fitting vertically on the
main board) to replace the lm324.  if it is surface mount already it's
still possible, even if it has to be a horizontal board and would be
less effort than redesigning the main board depending on vibration and
such in which case i'd say attach the driver board with silicon rubber. 
alternatively use a separate box to convert the outputs to a higher
voltage, that way the main board is still your' standard part and easier
to maintain and replace, i.e. build a separate box that converts the
0-10V to the higher voltage the client wants.  in any case you should
definitely be charging a lot for this design change!
 
> On Mon, 6 Dec 2004 15:42:51 -0800 (PST), you wrote:
> 
> >Anyone know of a 50V or 60V quad op amp that has the same pin out as an
> >LM324?
------

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Why is this man in the White House? The majority of Americans did not
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And I tell you this morning that he's in the White House because God put
him there for a time such
as this: Lt Gen William Boykin, speaking of G. W. Bush, New York Times,
17 October 2003 
= 
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the savior to the German people. We have faith, deep and unshakeable
faith, that he was sent to us
by God to save Germany. Hermann Goering, speaking of Hitler
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