Not sure what type of tong you maybe looking for, but here is an option..
http://ak-builder.com/index.php?dispatch=products.view&product_id=29794http://
I bought one of these for my son's sp125, and he said it works great...
http://www.ebay.com/itm/HTP-Argon-CO2-Mig-Tig-Flow-meter-Regulator-Welding-Weld-/140514184508?hash=item20b74c4d3c