Just pulled the fan from my 1998 Crown Victoria to replace the motor and noticed it fits the 4 core in my 71 blazer damn near perfect. It's a HUGE 18 inch fan, and since it's a cop car, it moves a lot of air. We all know how much time they spend idling, with the AC on. It has 3 wires so I am pretty sure it's a 2 speed. Specs: 18 inch blades, 27 inches wide, 19.5 inches tall. There are some on ebay complete, new with shroud for under 90. http://cgi.ebay.com/ebaymotors/RADI...ItemQQcategoryZ33600QQihZ019QQitemZ8071946683 I am already running 2 Iroc fans and they seem to be ok. Just thought some people would like another option.