I actually have those forks with one of my universal triple tree on them. It was straight forward swap. They are pretty cheap though. The PW80 forks are so much nicer! Huge difference in ride for just $20 more. I will actually sell my set of those 49cc forks with the clamps for the doodle buf for $95. Just bolt it on and go! They were used less than a 1/2 mile.
They are ok , not sure how much travel , probably 2" I guess . This set up is only good to soften the ride , really not designed for hard riding , You'll have to do some fab work if ya want something for harder trail riding or go with a swing arm set up !