OEM front sway bar sizes

There’s only one size 73-76 front sway bar that I know of. I don’t remember that exact measurement. But I’m sure it’s what you measured. Catalogs on these older cars are often wrong.

Only possible bigger size might have came on the 1974?-1976 A-body police cars. Very rare. An relative anomaly.

It is was it is. Different OE cars have different sizes. The width, arm length, control arm attachment point, wheel rate, and a bunch of other stuff go into determining the thickness of the sway bar.

There’s lots of different ways to get to the same place.

It all factors into the vehicle’s overall roll stiffness.

Get the right bushing and run it. If you want more roll stiffness (resistance) get a bigger sway bar and/or torsion bars.