The problem is that you can't easily scale them. Masks are designed to work at a spacific focal length so you can't easily scale mask for 80mm/600mm telescope to 120mm/600mm scope. There were several files I'll post links to them.
Here is the link to 200/F8 telescope by Pavel
http://www.astronomy.ru/forum/index.php?action=dlattach;topic=10421.0;attach=57433