its the additional cpl chips cooler that covers the cpl chips as well (for t2r) without that one (i.e. without cpl chips cooling) its for the m2r. but you can mod the t2r plate to cool the m2r cpl chips as well, but the smaller nb pwm chip would then be left uncovered. the problem is, that the small chip for the nb pwm section is a little higher...

i have the cpl chips aircooled.. works good..