This video shows how you can take an existing ruckus stretch, modify it a little, weld up a shock mount and install a stretch on a honda metropolitan
I now make and sell a full stretch kit 7 inches long too which is not shown in this video
And With my stretch you can make a fatty wheel conversion only needing a couple more parts to install
I have also redesigned the shock mounts so its much easier to put on the shock, no mods need to be done
Pics here
http://i117.photobucket.com/albums/o56/mikegigabyte/Honda%20Metropolitan/c05b09c9-5e1b-4875-90d2-55d00787523c_zps111299cd.jpg
http://i117.photobucket.com/albums/o56/mikegigabyte/Honda%20Metropolitan/CED9CD83-E07A-4091-A42C-ED3211F6CD3E_zps9wxfx3yw.jpg
check ebay to purchase this stretch kit user name scooternerds sometimes they are available for sale when I have them in stock