old coleman air condition fan

i have a old roof top coleman unit and surprisingly it works great for not being used for 30 something years  but the fan for it was mounted with rubber grommets that held it down and I guessing kept it from getting joseled around too much but the problem is that they have come loose and also it appears that they have shrunk a little and are not attached to the frame anymore my question is where could I get new ones or what could I use in place of them that would do the same ill post pic when I get a chance I hate to scrap the ac unit with it getting so cold and working so good I currently have it held down with zip ties while I work on the rest of the camper

thanks

cr