Thanks guys, sorry I didn’t mean to hijack the thread. CPW needs to clean up the process. There are at least two places on their website where it implies that for a plated vehicle one can purchase a permit at the CPW Shop and directs you there, but they have only park passes, no OHV permit. Then the registration PDF isn’t very clear and the process is off-line by mail.
Oh well, I also needed to buy a parks pass anyway.