If your moped was imported and sold during the 70's and forward, it has to have a tag stating something to the effect of " THIS MOTOR VEHICLE CONFORMS...etc."
It will have the year and month of manufacture on it. If your moped is a popular brand, they didn't change much in those years and parts should be available,
Always give the make when asking about you moped so the real "experts" can answere you questions.
Jim C.