Not sure about the part number but I have some genuine adjustable pegs on my 07 650. The range of adjustment is designed to go up and forward. I modded them to go down and back, but not as much as I'd like. I am going to get some Fastway pegs that do go down and back. The genuine ones are also expensive. Aftermarket pegs may not be listed for Bergs, but KTM ones fit later models, post, & including, 2000 I think. Mine also came in a KTM box.
Steve