Premier Aircraft Design has a Beech 99 in a Wiggins livery, just not that one. I too see their B99's all the time. The PAD model is very nice. One of my favorites to fly.
Heres the texture link, you'd need the base kit for your respective version of FS. (Link is about 1/4 down the page)
http://www.premaircraft.com/paintshed22/index.html