Ok, I'm going to help a friend of the missus out and fix their 1991 Suburban. Their kid rear ended somebody and the front end needs some fixin'. At first we thought the radiator might be bent, but it turns out it is intact, no leakage. But, I was looking at it and it looked awfully thin. I measured the core and it is only a little over 1 inch deep. I got online and saw that there are 3 and 4 core radiators available for it. But, I noticed that the 3 core is listed as 1-7/8 inches thick and the 4 core is 2-1/2 inches thick. So I measure his and it is barely over an inch thick. I found one site that had a Chevy radiator listed at 1-1/4 inches. I can't believe the Suburban could've come with that small of a radiator. Any burb owners out there know? I guess the point is moot because he told me he overheats all the time when towing his boat. Go figure with the thin radiator. So, I will swap a new one in for him. So here is my question, if I go 4 core, will I have to get different brackets and rubber pads? It looks like the 2 and 3 core radiators share the same outer tanks. Does the 4 core have a fatter tank? It looks like you could fit 2-1/2 inches of core in between the same tanks.