I have been browsing through the board for the last couple of months and i have noticed a very large amount of users that arent looking hard enough for their aircraft they want. There is a high posibilty there is the aircraft you are looking for at either of these sites

www.simviation.com
www.flightsim.com (requires log in)
www.avsim.com
www.fsplanet.com

I would recomend searching these sites thoroughly before posting a request