you do not have to change over the handgaurd retainer!!! That would be just making way too much work for yourself. less then 5 minutes time with a hand file and you can make any standard handgaurd fit.
If you look at some of the other hungarian AK's like the SA-85M and the SA-2000m, alot of those also have the same AMD style handgaurd retainer, and are all equipped with standard handgaurds.
If you want the correct lower handgaurd, order part# H-514 from globaltrades for $16.99, that is the correct blonde elm wood handgaurd for these rifles.
Pics coming, I also will take a detailed pic of the handguard modification, it is very simple.