I found a specific paint which is sold for models - maybe this can help you getting the appropriate color for painting your plate.
http://www.ebay.com/itm/AKAN-Paint-73005-Cockpit-Interior-color-for-MiG-21-23-25-27-29-31-Mi-8-24-/121497360631
Here is another link to some color chips
http://www.art-paints.com/Paints/Acrylic/Testors/Model/USSR-Interior-Blue-Green/USSR-Interior-Blue-Green.html
You could also do some further research for "USSR Interior Blue Green" - maybe it can be ordered in sprayable cans.