How to Plug Two Ports at Bottom of Radiator

[HappyZ]

I purchased a new radiator on amazon for my 7/71 240Z that actually looks quite nice.  The problem is there are two ports at the bottom of the radiator.  The ports are 14MM threads.  I went to every hardware, auto, and home improvement store to find a cap that would screw on to cap the holes, but they're not made in metric.  I believe the ports are for a 280Z.

Any suggestions as to how to cap them?

[SteveJ]

Ignore them. They are for the coolant lines for an automatic transmission. If you are worried about fluid getting into them for corrosion purposes, fill them with RTV.

[HappyZ]

To be clear, the channel between the two ports does not affect the rest of the radiator, correct?  I'm kicking myself for not checking that.  If that's the case, I will put some RTV in the holes.  Thank you for your insight.

[S30Driver]

Steve J is of course correct.  The do not affect the main cooling area of the radiator.   Many of the aftemarket manufacturers standardized on one model which includes the section for the auto transmission. 

[HappyZ]

Thanks to all...you've been most helpful.