81 xs400SH or xs400H

[Kitchi]

Hi guys and gals I have a 81 XS400 and am wondering what is the difference between the SH and H models?
Also how can I tell which one I have.
When I am ordering parts it seems to be hit or miss if I get the correct ones.

 

[Kitchi]

I found a thread explaining it
http://www.xs400.com/threads/is-this-an-xs400-or-400-special.12905/
Thank you anyways