How to change a4 to letter option in prosper

I'd like to change prosper's a4 to letter since we use
that as the standard paper here.

Can someone suggest me what hacks I need to put in
prosper to accomplish this?

I changed "a4paper" to "letterpaper" in prosper.cls.
Also I noticed the following:
%% Some code to be added when creating a PDF file
\def\Cropping@Box{0 0 595 890} % By default: cropping
to a4 paper dimensions

I'm not sure what dimensions to put as I can't seem to
figure out the units. Does anyone know?

Does anything else need to be changed? Thanks. I'm a
newbie with prosper and latex.

pallav

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