From a 69 camaro.  Dimensions of the stock TGP radiator are:

20? x 15 3/8? x 2 5/16?

Inlet 1 3/8"
Outlet 1 1/4"

The camaro radiator dimensions are

20.75" x 17" x 2 "

Inlet 1 1/2"
Outlet  1 3/4"

Here is a cheep one on ebay http://cgi.ebay.com/ebaymotors/1969-Camaro-Radiator_W0QQitemZ280229599131QQcmdZViewItem?hash=item280229599131&

Even has provisions for auto trans cooler for you non - stick guys. 

With mild modification and some new hoses this could be a good replacement for our radiators for those who wish to keep their tgp's in stock appearance. :)

Ken

that's pretty damn close, good info