1973 dart sport brake booster

Yes, sort of universal.
Designed for Chevy because it looks like a Corvette booster.
But like all universal parts, these boosters have to be adapted to the car, e.g. the mounting studs are in a square and measure 3 3/8" center to center. On our A-bodies, the holes of the mounting bracket have a rectangular scheme. So, you'll have to enlarge them to match the mounting studs squared scheme. Quick job with a good round file.

And another trap : the brake line ports
On our original Mopar A-bodies master cylinder, the brake lines fitting nuts are 9/16"-18 in front and 1/2"-20 in rear
MC3.jpg
The "Chevy" master cylinder has the brake lines fitting ports are inverted : 1/2"-20 in front and 9/16"-18 in rear.
You'll have to modify your line ports or use Edelmann master cylinder adapters #258306 and #258307 (cheap and easy)

And don't forget to buy the extension rod eyelet to connect the brake pedal link (it's not provided with the booster)
Extension rod eyelet

Other than that, it's plug n' play. :)