extended length power and remote cable

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http://www.millerwelds.com/om/o898d_mil.pdf I'm sure alot of people are going to think this is a stupid question but if you could look at Page 16 item numbers 12 and 16. The unit comes with 8' cables for the power cable item 12 description is CABLE, port No.18 3/c and for the remote cable item 16 description is CABLE, port No. 20ga 5/c. Now are these special cables that I have to get threw miller or can I just find them at a store that sells cable? I want to put 25' cables on the unit. If anybody could reply with a link to where I can either get some from miller or where I can get elsewhere that'll be great!