MaxMax sells a wide range of filtering products for cameras. I'm a customer of theirs who had hope to use their front mounted filter to use my IR modified camera (modified for astrophotography, not IR work) for traditional street use.
I found their product not satisfactory. The initial filter had extremely poor quality control, you could see visible differences in the amount of filter material. The replacement (which arrived quickly and without complaint) was a different color than the original one. I was never sure which was the correct filter, the original or the replacement.
Autofocus did work with the Canon 40D, but it also worked without the Maxmax filter. Images looked fine with a custom white balance, but they also looked fine without the Maxmax filter.
I asked for a refund and was refused. To their credit the website clearly stated that refunds were not available.
So, they have a wide range of filter glass available, but triple check that what they have suits your needs.