Steering wheel buttons

The buttons for the radio controls are starting to crap out on my '04 Trailblazer. How can I replace these buttons?:screwy:chrome://easygestures/skin/autoscrolling.pngchrome://easygestures/skin/saveImageAs.pngchrome://easygestures/skin/copy.pngchrome://easygestures/skin/cut.pngchrome://easygestures/skin/paste.pngchrome://easygestures/skin/duplicateTab.pngchrome://easygestures/skin/closeTab.pngchrome://easygestures/skin/back.pngchrome://easygestures/skin/bookmarkPage.pngchrome://easygestures/skin/bookmarks.pngchrome://easygestures/skin/largeMenu.png
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