The HU - 613 model radio has a row of three rotary knobs along the bottom. The units came in two colors; a lighter grey one (pictured) on all 2001-2003 models, and a very dark grey / off-black one on all 2004-2005 models.
To get the replacement knob you need, specify which color stereo you have & select between a volume control knob or one of the two smaller programming selection knobs on the right.
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