All the sites show rear  caliper rebuild kits only not front.

Easier and cheaper to buy a used caliper with low miles from ebay.

http://www.ebay.com/itm/06-2006-Suzuki-GS500F-GS500-Front-Right-Brake-Caliper-GS-500-S100297-16A-/121319499657?pt=Motorcycles_Parts_Accessories&hash=item1c3f34a789&vxp=mtr

SV650 right front caliper works as well.

If you really don't want to go that route, you can buy new seals, or new pistons with seals, and the rubber boots individually from any online dealer.  Just navigate to the parts on the OEM parts microfiche.

ronayers.com
partzilla.com
rockymountainatvmc.com
bikebandit.com

Took your advise purchased a SV650 with 5000 miles off eBay now I know the exact caliper if I should need parts. Thanks