Not sure what width mower you have....(Part # for 5' is 7555, 6' is # 7556, and 7' is # 7557) Those will be hi-lift blades. Depending on how old your Squealer is, they may or may NOT have been equipped with hi-lift's from factory. They'll do a MUCH better job. Old style "low lift's" are no longer available from what I'm told. They are bolt in replacements. "Low lift" blades at one point were thinner/lighter than the part #'s I furnished (by just a couple pounds) You'll never know the difference, EXCEPT for the fact the heavier duty blades will hold up a little better.
As a bit of an experiment, I tried one set of aftermarket blades (from TSC) They didn't even come CLOSE to matching the life span of a genuine Bush Hog brand blade. Prices were pennies apart. Kind of a no brainer there....
DO NOT attempt to weld a broken blade unless you just want to live an (extremely) dangerous life. Just not worth the risk.
Last 3 sets of 7556's I bought were priced under $55 a set, inc freight.