I have just inherited a thick unicrown fork blade set. Not my usual thing. The tubing isn't parallel sided, but it is too fat for normal road plug ins. The end would be maybe 3/4", and up by the shoulders more like 1 1/4". Looks pretty unbendable to me, are these kind of blades designed only for straight fork aps? Sorry I can't be super specific on the dimensions, I am nowhere near the shop and won't have shop internet for a while.
My guesses were dead on. 1.25 tapering to .75. It could be bent as you say, but I was just holding the thing in my hand again, and it really looks like way too much for my normal fork bender. It is just for me, and I could notch it and reweld it, though it is hard to see any good reason to do so other than the look.