I've gone to over a dozen web sites but not one of them will tell me the difference between the Fisher & Paykel Zest model HC405, HC406 and HC407 and I can't seem to find any model number on my mask itself.

I'd like to upload a picture but no one has told me how to yet.

I got it from a doctor a year ago.

how do I upload a picture to my posts?

I have a Fisher & Paykel nasal face mask for which I need to order replacement cushions but I don't know if I have the HC405, HC 406 or HC407. I see the Zest word engraved in the see through plastic but I can't tell which model I have so as to purchase the correct cushion replacement. the triangular...