Nope, you can't buy them from the DMV. You are allowed to have year-correct plates up to 1962 but after that you are not allowed. It is a screwy system and the CA DMV website explains it.
I wanted yellow on blue plates on my mid year car and found out I can't have them...legally
If you buy a replacement plate from that website you have to have them delivered to another state and then transhipped to your California address.
How I "heard from a friend" that you can order personalized plates from the DMV and THEN have the same numeral plates made by the licenseplates.tv website made in the era plate you want. When you go to pick up the plates at the DMV they hand them to you in exchange for your old plates along with your registration stickers. Then IF you wanted to you COULD put those stickers on the repro plate and viola, you're running indetectable era-correct plates.... but as I said, my friend told me this but I would never do it myself!