Greetings,
Unfortunately, there are no lowpass filter modules compatible with the SC-2040. One option you may want to consider is an SCXI system with an SCXI-1140 (8-Channel Simultaneous-Sampling Differential Amplifier) cascaded with an SCXI-1142 (8-Channel Bessel Lowpass Filter). Below are links to information regarding these modules:
SCXI-1140SCXI-1142Good luck with your application.
Spencer S.