first of l have blizzard 603+ 240 mhz 040 scsi
and freind mine who knows electronics fixed my fan.
if indoubt get somone qualifed to do this work.
u need to use termal paste as this is what tranfers
the heat to the cpu cooler .
l think standred ones are fine l ran my bbs on my machine 24/7
with no problems
u can buy new ones from amikit.