valaint wagon parts help

well the yard is searching for the best wagon tailgate they have and will give me a price variying on the condition as long as the hinde mounts arnt rusted and cracked away from the tailgate 3/4 of the way on the pass side i think it will be worth it.

anyone have clues on what to use as a gasket for the tailgate window at the top of the tail gate? it a peice of rubber 1/4 in thick curved and the leignth of the window.