Were these bikes hard to come by? The only difference is the color ,correct. I was just at the dealer and they had both 250 and 450 there. They are in southeastern Wisconsin and he wants them gone. He also has plenty of leftover 250f's and some 450's to move. The shop is Glenn Curtiss Motorsports in West Bend. I don't work there or own it he is just a good guy who has helped my racing effort for a long time and I think any friend to racers should be acknowledged. Sorry if this steps over the rules on here.