MSA Comfo Classic P100 to 3M adapter

Do you have an MSA Comfo Classic Respirator mask, but no P100 cartridges? Have 3M P100 filters or access to them? I am experimenting with a comfo classic I have and have replicated the threads for the replacable cartridges, but have no 3M p100 filters to test this. I thought in might be useful for someone with Covid 19, the corona virus worsening. Please message me if you have any questions or ideas. I am working on a way to use hepa filters with the inner thread design as well, which will allow fully reusabe filters for this type of mask.