The only suzuki forks that look like that and are pre 78 legal are RM125B forks. Easiest way to confirm if they are 77 125 forks is to measure the slider from axle hole top top of the slider. They should measure 295mm. 250C are 315mm. There are also cast numbers near the axle holes which can also ID the forks.
The forks and triple do look either like 77 125 or 78 250 C but only the slider length and cast numbers can confirm exactly what thay are. I have both 125b and 250c forks, so know the differences. Those forks look quite long too. They may have the negative springs removed or have longer damper rods in them. Even if they are 125b forks, they possibily will need correcting to stock travel for 9in limit, if they are not stock at the moment, if you are intending to race.
That bike has a 79 or later tank on it.\
Pipe is not a 76 item either.