I just compared the cutting diameters and ferrule size' s of the 100 and 125 grn deadheads to a few other heads. The back of the ferule is about the same size as a Muzzy 100 grn 3 blade. The difference is the Muzzy ferule is taperd in the middle, while the deadheads is straight all the way through, but like I said the rear where it matches up with the arrow shaft is about the same. It should be perfectly even with 22 series aluminums, but may be a hair smaller on the 23 and up sizes. Of course they are larger than the ICS type carbons I have laying around.
I don' t remember if the cutting diameters are 1 1/8 or 1 3/16" on these heads, but it' s one of the two. Not Much differnce 1/16" anyway.
I would guess they will match up with the stingers better than most heads out there, but I believe they will still be a hair smaller, they are excellent heads though, and acording to Golden Key they have improved the blade sharpness.