Compatibility: Cokin ND+my Matte Box

Hi everyone,
I'm trying to find affordable nd filter for my 4x4 matte box. I found filters by Cokin (z-pro series: http://www.cokin.fr/ico15/ico15-haut.html?=#z) and Z-pro has dimentions 4x4 - same as my matte box. But these filters are for mounting with Cokin adaptor. My problem is that I don't want to have Cokin adaptor, but want to use my Matte Box instead. So, can I still use those filters with my MB? Has anyone tried this setup?
Or if that's not the best option, could you advise another affordable option.
Thanks.
 
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