http://www.wynnenv.com/9e300bl_conversion.htm

tells the whole story with pictures.....

cc wrote:

For those that have the 1200 CFM rated DC from HF (yea, I know
already), has anyone tried replacing the top bag with the Wyne
cartridge? Several threads recommend this to increase filtration area.
What part # did you use and why (there are multiple ones that could
work).

thanks for all helpful comments