hifi engine

I NEED FUNCTION & VOLUME KNOB FOR AN AIWA AV-D55/58U RECEIVER-ANY HELP!!

I'm looking for a function, and volume control knobs for an AIWA AV-D55/58U, it goes on the left front.Or any info on an AIWA dealer in the US.The service manual lists the PN's as-8Z-AR1-012-010 & 8Z-AR1-017-010..Any help would be appreciated!!