Owen. You've shown up at a site that can help you a lot. I'm fairly familiar with Ultra Vans. Just about bought one once. ( My Yenko 108 is a give away. ) So I assume that you thinking of installing a GMC wet bath in your Ultra. Is this correct? If I can help. My cell is 319-521-4891 Bob Dunahugh Member GMCMI 78 Royale