I use www.cycletrader.com to find some of the stuff they have in stock. Heres one bike, I dont know if it has the part you need. http://adcache.cycletrader.com/5/4/5/1414045.htm
I looked for you guys but I couldnt find you. I turned right at the krogers and found saber but it was all residential houses and I didnt think you would stunt there, so I left. Could I have better directions for next time.
You might want to email the guys at cycle search international. Sometimes their prices are high but it is still cheaper than buying it new.
www.390bike.com/
I couldnt find a 8 hp model. I did find a 6.5 for around 300 retail and 10.5 hp for about 600 retail. Depending on how much it costs me I could probably give you atleast 50 off the 10.5 hp.