Line 6 only uses 2 different 1/4"" input jacks on their products, so if this looks like the one you have, it is! This part is used on: POD XT Live and Pro POD X3 Live and Pro POD HD 300, 400, 500, 500x, Pro POD Studio and Tone Port series Duoverb Vetta I, II Flextone III HD147 Low Down series amps M series Stompboxes Spider Valve series Spider IV series (excluding 15w and 30w) DT series Amplifi series Firehawk Line 6 recommends these parts be installed by an authorized Line 6 service center. Line 6 assumes no responsibility for any damages done to your product while installing this part. All sales are final, no refunds or exchanges. 21-00-6617
A list of support manuals can be found at http://line6.com/support.