I wish I could tell you which brands will work with which other brands, which are too short or too long for which brands, but I don't know. Heck, like I mentioned above, I bought two of the same brand of aquariums that have two different frames on two otherwise identical 55's, and their own brand of tops don't fit one of them, so who knows? Even trying to get an exact measurement from someone over the phone isn't garaunteed, because some people place the hook of a tape measure on the end and read it (the carpenter's method) and some place the 1 inch mark at the end, take the measurement and subtract the inch (the accurate, woodworking method), and it makes a difference. And then, of course, there's a good chance these days that the other person can't actually read measurements at all!
Good luck, Gwen, 'cause I don't have a clue what to tell you!
"May the Fish be with you."