YOM plates can not be used on vehicles later than 1962. It is not to hard to accomplish if you find someone at the local DMV who will take the time to help you out. GOOD LUCK with that!!!
Best bet is to contact you local DMV and get the local info. For CALIF you can get most of the YOM info here: www.davesclp.com

"If it ain't Steel it ain't Real"
"Earth the insane aslyum for the rest of the Universe"
41 1/2-ton, a work in progress
68 Shortbed stepside 327/325hp/700R4