anybody here have a cruisair air conditioner, carry on? need filter dimensions

Hi all. My filter to my (larger size, 7000 BTU I think)cruisair air conditioner has gone awol in the refit mess. I cannot get the dimensions nor a filter from the local dealers, and the wholesaler is out of filters and hasn't got the dimensions either. I called the factory and couldn't get the dimensions out of the four people I spoke with there. I just want to go get a furnace filter and cut myself a filter so my air conditioner will work. If anybody has the larger cruisair unit that drops in the hatch, and wouldn't mind measuring the filter, I'd really appreciate it. Thanks in advance. girlsaylor