If Jedi is right, and you do in fact mean that find doesn't support -exec instead of "Busybox doesn't work with -exec", then the answer to how to get -exec working is simple:

Either
a) install findutils-gnu or
b) install busybox-power

Both of those packages will provide you with a find binary that supports -exec. If you go with findutils-gnu: make sure to use /usr/bin/gnu/find instead of /bin/find.