Which Norton Utilities works with OS9.1?

[Small Moose Ltd]

Hi there,

I once heard that Norton's 5 doesn't play well with OS9 (not too sure about
this). I would like to know which version of Norton is optimised to work
with Mac OS9.1 and 9.2 (my sister uses 9.2 on her Mac).

So far I've gotten by with just Disk First Aid and Techtool Lite, but I want
to be ready for a Black Wednesday, and I've been dodging the reaper for the
last three years. 

I'd like to make sure I get the right Norton's.

Thanks.