Hello Mike,
As mentioned above, Chrysler did offer the 22" radiator core on various big block powered Chrysler, Dodge and Plymouth models as shown below in the pages from the 1969 Factory Parts Book. I've included the pages that show both the factory radiator fan shrouds and the various radiator cores for all of the 1969 models. including the parts that relate to your particular R/T that are listed in the column under "W" for all of the 1969 Coronet models.
As Mopars & Missiles mentioned, fan shroud part number 2949 129 that you asked about is only used on various 1969 models including Coronets with a 22" radiator core, 225 Slant Six engine and without factory a/c and will not work with your cars 440. As you can see in the part listings below, Chrysler used very specific fan shrouds for various engines and various options, so they are not all interchangeable between various engines and options.
For your R/T with it's 440 and 22" radiator core and without factory a/c, this is the fan shroud that you will need to find.
Part number: 2949 130
1969 Factory Parts Book section number: 7-08-2
Part description: fan shroud, radiator core, for 22" core, with 440 engine, without air conditioning
Applications: all 1969 Plymouth B-Body models equipped with a 440 engine, 22" radiator core and without a/c
Applications: all 1969 Dodge B-Body models equipped with a 440 engine, 22" radiator core and without a/c
Applications: all 1969 Plymouth C-Body models equipped with a 440 engine, 22" radiator core and without a/c
Applications: all 1969 Dodge C-Body models equipped with a 440 engine, 22" radiator core and without a/c
Applications: all 1969 Chrysler models equipped with a 440 engine, 22" radiator core and without a/c
Part number: 2949 130
1969 Factory Parts Book section number: 7-08-2
Part description: fan shroud, radiator core, for 22" core, with 318 engine, without air conditioning
Applications: all 1969 Plymouth C-Body Taxi models equipped with a 318 engine, 22" radiator core and without a/c
Applications: all 1969 Dodge C-Body Taxi models equipped with a 318 engine, 22" radiator core and without a/c
Applications: all 1969 Plymouth C-Body Police models equipped with a 318 engine, 22" radiator core and without a/c
Applications: all 1969 Dodge C-Body Police models equipped with a 318 engine, 22" radiator core and without a/c
I hope this helps.
Richard