I have it on good authority (and just tried it myself) that the fan clutch for a '97 blazer (with a/c) is a perfect fit and works well. The shop owner that told me about it has about 80,000 miles on his and has installed many. Just need to get larger bolts (10x1.5x15mm) and slightly enlarge the bolt holes in the fan.
NAPA part# 271336, $52 retail, instead of:
http://www.roverparts.com/Parts/ERR4996.cfm $230..
NAPA part# 271336, $52 retail, instead of:
http://www.roverparts.com/Parts/ERR4996.cfm $230..