I'm stumped!

WOW! Thanks for the sudden responses & good suggestions. At least I'll quit wasting my time trying to figure out why what I have now doesn't fit - It never DID!!! Oh well.....
Neither my aging body/talent nor my budget are up to installing A/C, so I may go into 'heater delete' mode for the time being and direct energy on other stuff. There's always 'other stuff'. :)