To be honest the whole "Gen 1" & "Gen 2" theories confused a lot of people, there was a lot of inaccuracies and most of it was just speculation. As you can see there's about 6 versions of pro-jumps so you could call it 6 gens... so in the 2 gen theory you missing a lot of detail out!!!
For spares easiest way to determine what you need is check which version of Pro-Jumps you have and cross reference it with the hoofs you had then ask yourself two questions:
1. "was it straight or did it have a bend in them?" and
2. "are they the bolt on ones or not?"
And if you need help I'm always here