Use the search function at the top of this page. Be sure to look for leaks in 66 to 68 Corning type windows. Andy at Inland Supply....contributer here, has info for the use of silicone (bad word here) on the hinge of those windows. Vintage trailer Supply and Inland have rubber seals if required.
"If it can't be reduced, reused, repaired, rebuilt, refurbished, refinished, resold, recycled or composted
then it should be restricted, redesigned or removed from production."