It looks like it has Klipper Kart pedals. Seems they welded the pedal pivot tube to the front of the square axle beams and then configured or “bent” the pedals in a Z bend form to fit over and around that beam. So it’s a Klipper Kart, at least until we know more.
We can tell for sure that it’s an old, classic, domestically-produced fun kart, the BEST kind in my opinion. The parts were basic, generic, off-the-shelf parts for the most part. What part do you need?
Maybe JimD can tell us the make and model with certainty, he has all the manufacturer brochures. . .