Update....
Thanks for the replies so far. Though this site, I found Colonial Arms, which seems to be well stocked in the choke tube market. I picked up skeet 1, skeet 2, and improved modified chokes for my 20 guage Baikal.
So now I am thinking...
Skeet Range= Skeet 1/Skeet 2
Trap= Improved Modified/ Full
5 stand= Modified/Improved Modified
Does this sound about right?
Thanks,
Smoky