Oreowagon

Anyone? 

Hi all, I'm looking for the stamped chassis number on my 75 catalina, I need to go register it after importing it a while back, they need to see a stamped chassis number  the dash plate won't do, i have been told its on top of chassis at rear passenger side but after a lot of wire brushing and sanding I can't find anything! Anybody know exact location? Any help much appreciated thanks