Big block headers

I have a set of new hooker 2" primary fenderwell headers I would trade for the tri-y headers what size primaries are they? I haven't ever really seen partial fender well headers before except for maybe custom built ones otherwise I've only seen ones that either go through the fender Wells or inside the frame headers not ones that go both ways
There are several brands of big block/a-body headers that have (at least) one tube that goes thru the inner fender, then loops around under the frame to the collector. I have a custom set that has two outside, two inside on one side of the engine, and three outside, one inside on the other.....