Hey guys. I got a reply from Boyesen. Here's what they said.
"The Boyesen Power Reeds for a 1999 Kawasaki KX250 are part # 688. When installing the # 688 Boyesen reeds, you will only install the small metal rev plates included with the Boyesen reeds. Do not install the stock reed stoppers."
Good to know.
Reeds look great and seals flat to the cage. Should be a good upgrade from the old ones. Didn't tighten them too hard and used some blue Loctite and small split washers, so I am sure they wont be coming out.
Also, I managed to pick up a torque wrench for an absolute steal. Got this guy second hand, but unused, for R220 which is about $20. Now I can torque everything on the bike to spec instead of guessing.
Happy holidays to everyone! A merry Christmas and a happy new year.
Ed