One of the problems now with these being so popular is that people think that just because it looks like a Mark VIII fan it is a Mark VIII 2 speed fan. There were about 5 version of this fan and some were a single speed that was operated by a variable speed controller. Your looks to be a 2 speed. If the connector on the fan was white and there was a small inpection plate just above the connector it would be a single speed. The easiest way to tell is test it. There is a significant difference in speed between the hi and low. If you get a junk yard fan get the plug with it especially if its a Taurus fan.
These may help in determining your wiring needs
http://www.thehollisterroadcompany.c...VIIIrelay.html
http://www.thehollisterroadcompany.com/MarkVIII.html were I installed it in a C10