JimmiV, don't be bashful. Call the vendors and ask who made the radiator your interested in but don't tell them what make your looking for or it may be the one they say!!
I won't go into vendors here. As part of the homework call and ask at least two preferably three different places. Also not that there are a couple places that give Stovebolterts a 10% discount. (JimCarter and Classic Parts bot in Mo.) However, be ware that even with the 10% discount it may not be a good buy depending on "beginning price". Look at prices, discounts and shipping....see what the bottom line is.
Also think about if you will ever need a tranny cooler in the bottom and if so order it with the cooler in it now. Also ask if its a 3 row or 4 row...... and maybe the width of the cooling tubes. It may not make a difference in your application.....but then it might?
and lastly, there is a lot of good info here if you take the time to read it. It will explain a lot things.
http://www.usradiator.com/cores