I emailed
sales@antiqueautomobileradio.com about a radio for my truck. Here's what they told me:
Subject: 69 Chev C10 Pickup Radio XM Ready
www.antiqueautomobileradio.com
We have an original radio for your 69 Chevy truck. It can be converted to
AM/FM stereo with hook-ups for up to 4speakers on a 12volt system. The
conversion is done inside the case by replacing the original electronics
with our stereo board. This keeps the look and feel of the original radio
but makes it sound like a modern system. We install RCA jacks on the radio
to hook up XM or a similar device with these plugs. The converted radio is
$495.