Hey, well..GilaMonster. Better not go with GM. We already have one of those, and, well...never mind.
As far as the Chinese/Norinco AK scope mounts, are you looking to put a scope rail on the side of the receiver permanently? (I take it there is no rail on yours?) The mount that you have pictured is for the Euro/Commie-style side rail on many AKM's and AK-74 style rifles. I don't believe I've seen an imported Chinese AK that came with a factory scope rail already mounted. A few of the Commercial Chinese AK's like the Norinco Hunter came with them but that was an exception.
Try not to go with the aftermarket scope mount that attach via the Top Cover, etc. You won't have much luck with holding zero or that great of accuracy. If you have a good AK builder close to you and want to have a rail riveted to your MAK-90, that would be your best bet. The mounts are fairly common, although currently many places are out of stock on the good ones.
The style mount I'm referring to, on a WASR 10/63:
There will be others that will have more and better suggestions. Welcome to the board, BTW!
firstchoice