Where I live now doesn't have anything...so ,like I've done..Ebay.
I Have a pair of NOS points for an RD350, but I can't seem to find a cross reference to see if they'll fit you're RD200.You'll need to remove the Alternator cover and clean out the rings on the stator and clean up the brushes,etc.You should be able to use the plate...unless it's really a rusty mess.