I recently acquired a used .40 trainer, balsa/ply construction with non-original covering. The plane is a 60" high-wing (Cessna styling) with aluminum-strut mains and steerable nose-gear. Under the fuel-tank hatch is a label for tracking battery flight times with two entrys back in '95. At the top is a space for the model name, with Eagle written in. The bottom of the label is printed Ace R/C, Inc. No other markings have been located yet. I would like to identify the air-frame, in case I need repair parts (may be a moot point given the apparent age of the plane).

It's probably an old Ace Hobby trainer and you are right it is probably out of production. You may ask around on here most likely somebody has one or knows where one is.

Could be a Goldberg Eagle?

How about a picture!