The core is 91 cells wide by 22 high.
I took some pictures of the radiator on the Travel Air 2000 at the Virginia Aviation Museum. They are identical. Their's is missing the louvers but it has the mounting bolts for them. The strange thing is they're the same color. I can only assume it was the standard factory color and the Museum plane was restored to it's original color.
The clamps to mount it to the longerons appear to be for 1" diameter tubing and are set up for longerons 32 3/4" on centers. I have not closed the clamps down to measure the tube size. The bolts which attach the 2 clamps on each end are 3 3/4" on centers.