With a syringe filter setup I get and see the .2 Whataman filters for sale. Why don't I see this available for a glass vacuum filter setup? How do I know what filter will fit my setup and what size filter do I use? There's a million choices of these and the setups I'm seeing it's not really obvious to me. The number system used for syringe filters and paper filters seems different. Even the bottle top systems use the syringe filter numbers but buying the glass setup I'm not seeing these same options.