Thanks for the quick reply.
the filter isn't actually for a 750D case, it's actually for a custom case that I plan to build myself, and I just thought that the 750D had a nice sized top fan area and wished to copy it
Does anybody know the exact dimensions of the top fan filter of the Corsair 750D?
this is the exact thing I am asking about: http://www.corsair.com/en-us/750d-top-panel-mesh-filter
I think the best path for me currently is to get the 900D front i/o and take that one apart. My front will have specifications different to any case so i doubt I will be able to transplant one from a different case.
I'm not planning to do this till close to july, so keep the ideas flowing. thanks for the idea, I'll just keep getting more ideas together and then pick closer to the time of the build