FC3S-FD3S lug converison?
 

is it possible to convert the 4 lug Fc3s to the 5 lug Fd pattern.....as i was wondering if u can mount the Fd stock rims on an Fc?

The 5 lug FC bolt pattern is the same as the FD bolt pattern. Just do the brake upgrade to the 5 lug system. The FD wheels have the wrong offset so they are a little too far in. You'll have to space them out about 1". I had the 3rd gen rims on my 2nd gen for years. They look great.