I went with bruce's for the travel air and am completely satisfied, but whoever you go with, I'd recommend that you get a cover that does all the way down to the wing and has no zipper opening for the door. For the antennas get socks, not holes. Do these things and your cabin will stay dry, don't and water will find it's way through the door seam in a driving rain. It shouldn't, but it will.
Alternatively, you might try the custom cover that i use on the pawnee: