Please post a photograph of your front wheel so we can identify it. Some Viva bikes have a conventional Chinese wheel, and others have the same wheel as my Zongshen ZS200GY-2.
If the spokes are too long, you are lacing them to the wrong holes in the rim. Try shifting the spokes to the next farthest hole.
I also suggest you call Roketa.com once again, and tell them you are having problems ordering online.
__________________
Spud
"Never argue with an idiot. He will drag you down to his level, and beat you with experience."
Mark Twain
2015 Zongshen ZS250GY-3 (RX3)
2006 Zongshen ZS200GY-2 (Sierra 200)
2005 Honda XR650L
2004 Honda CRF250X
1998 Kawasaki KDX220
Mods made to my Zongshen ZS200GY-2:
http://www.chinariders.net/showthread.php?t=6894