You may not need an aftermarket cooler.
Update your post to include full system hardware specs and OS information.
Include PSU: make, model, wattage, age, condition (original, new, refurbished, used):
Disk drive(s): make, model, capacity, how full?
Fans: make, model, capacity?
I am not sure that the cited temperatures are (C or F degrees ?) are that much out of limit.
And a few degrees lower may or may not make a difference.,
Plus having two intake fans and only one exhaust may actually be bottling up or otherwise reducing air flows.
Update you post according and, if possible, take a couple of interior case photographs.
Post here via imgur (
www.imgur.com).
Very helpful to see and understand the bigger picture.