If you want to make your own cables for the machine you own-you can use a 4 gauge or larger cable with ground clamps and electrode that you can purchase anywhere. However the plugs you need (the male jacks that plug into the machine) are 3/8" jacks that I believe are only made for Century. At least I haven't found any place else to purchase them. You can purchase the part number 239-052-908 Welding Jack Set from our website at
www.welder-pros.com
The direct link is
http://welder-pros.com/century_and_lincoln_parts_and_accessories.html
As to your question about which you cable you lengthen would be better-with your machine it probably does not matter significantly since you do not have a high frequency attachment. However if you coil up the cables, you tend to lose efficiency. Therefore it is usually better to lengthen your 230 volt cable, if you can conveniently move the machine closer to your welding project.
Any other questions? Let me know.
Thanks, Mont Howard
Howard Equipment and Supply
1424 N. Hwy. 91
Shelley, ID 83274
Office 208-357-3200
Cell 208-251-2123 www.welder-pros.com