The limitations on employers and the penalties provided for in Section 432.7 shall apply to a conviction for violation of subdivision (b) or (c) of Section 11357 of the Health and Safety Code or a statutory predecessor thereof, or subdivision (c) of Section 11360 of the Health and Safety Code, or Section 11364, 11365, or 11550 of the Health and Safety Code as they related to marijuana prior to January 1, 1976, or a statutory predecessor thereof, two years from the date of such a conviction.