Very common.
The Ford replacement is solid, not hollow like the original (In the center) and lasts. They have a purple dot on them. I don't think anyone makes a thicker bar than the original/replacement ford bar. (good for handling)
My Eibach is quite a bit bigger than my stocker. Also, my stocker broke at one of the bolt holes, not anywhere in the middle.
thats where mine broke on my gt. got eibach front and rear sway bars for it. they stiffened it up a good amount over stock. it had stock springs too.
they are quite a bit bigger than the stock ones that were on my gt the front one is huge