Are there any aftermarket head units that will work with the Harley XM module or does that module only work with the HK radio? Thanks.

 

I believe the XM module only works wit the HD setup.

 

Thanks, that's what I thought.

 

All XM modules are brand specific.
HD,Sony,Kenwood, etc.
You should be able to get a XM module for your brand of radio. You can pick them up at Best Buy or the like for around $100.
By the way that is a whole lot cheaper than the HD module!!