another 69 radiator question

[70lt1z28]

i am still trying to figure out my radiator probelm, maybe someone here can help. the radiator on my 69 L-78 car has its original tanks and tags however it was recored. it now has the wrong channels running along the top and bottom of the core. this is what I would like to correct.  HEARTBEAT CITY  sells WHAT THEY SAY ARE  the correct channels which are 2 3/4 inches by 23. my core is only 2 inches wide. i guess my questions are :
 
1. how wide is the core on a 3 core radiator?
2. how wide is the core on a 4 core radiator?
3. did someone just recore mine with a 2 core?

4. if anyone out there has an original 3 core with the original channels, are the channels flush with the core or do they hang over each side to make up the extra 3/4 inch?

5. do i maybe just need a whole new core??


HELP   LOL

[JohnZ]

The upper channel on my original '69 Z/28 "UH" 3-core radiator is 1-3/4" wide, and so is the core; the edges of the channel are flush with the core surface on both sides.

[70lt1z28]

i am late , but thank you