Alecur,
I found this site, it's actually pretty good. Lotsa photos of real Fishbeds, including a couple of walkarounds.
Also, there's a pretty good modeling section with a gallery and some good info.
http://216.110.156.31/mig21.htm
The OEZ and KP kits are the same model. If you see an ESCI MiG-21 it, too, is the OEZ kit. HiPM also released a version which enabled you to build a MiG-21UB.
Aeromaster released the kit as part of their "Choice Kits" line, with all the aftermarket stuff included. That may be what you were thinking of, upnorth. Here's a look at that one:
http://m2reviews.cnsi.net/scotts/mod/mig21preview.htm
Hasegawa released 1/48th MiG-21's? They must have been someone elses kit, 'cuz they don't have one of their own. It wouldn't surprise me, they've marketed pretty much the entire Monogram catalog over the years; and the Secter Fiat G.50, USA Model O-1... the list goes on and on and on and...
Fade to Black...