I, and many others, prefer to buy Nissens' 3-row ("heavier-duty cooling") radiator -- it is a 3-row, all metal design instead of your OEM 2-row, partly plastic design.

But the point is, this is sold as applicable to both manual and automatic transmissions -- if you have a manual, you simply have no fluid lines to attach, in which case you should keep the plastic caps (that come with the radiator) to keep the ATF cooler closed and therefore free of moisture and dirt, which might otherwise be subject to internal corrosion.

So you might as well buy the less expensive, automatic transmission version --it won't hurt anything.