Sizeup,
I'm not sure how they compare in size, but in my 29 Essex coupe I used a radiator from a 1967 Ford Pickup w/240 ci inline 6 cyl.

RADIATOR, 18 3/8 X 18 3/8 CORE Replaces OEM#: C6TA8005AD,C8TA8005BY,C8TA8005CR,D0TA8005AB,D6TA8005ATA

I found a used one and had it recored with a supercooler 3 row core. I also had to trim off the side mounts and fab my own to mount into the shell. I also had the local radiator shop move the filler neck to a more accessible area. Total cost was less than 250 bucks and it look and cools great
I've attached a pic from an online radiator site of the shape of the radiator. The side pieces had to be trimmed.

I have a few pic of my car on my website. www.nucwa.com/page2.html