No I don't. I would check their websites -
http://www.ventura.org/beach-front-parks/
http://www.venturaparks.org/
From my memory, the sites are all different sizes. I know there were a few that were huge and a lot that were really short. You will never know what is available until you get there. It is hard for us to get those spots as we are coming from AZ and rarely plan on staying there. We have been lucky a few times and just rolled in and found spots. In the winter, it is fairly easy to get spots on Rincon. I haven't really tried the other two.
I do not have lengths for the Ventura County parks, but someone may want this for the other parks nearby -
http://www.parks.ca.gov/RVlength