I bought this radiator on ebay because it has the mounting brackets welded to the side and my cars came without a radiator and subsequently the brackets on the side of it.
But this ebay rad does not fit, its pretty bad. Unless I am making a severe oversight here it is just plain made wrong.

This is the biggest problem, the mounting holes are lined up sideways but it needs to go down about 1/2 inch or so. It is resting on the sway bar.

Needs to be lower if i want to use the stock airbox.

This is the situation on the other side, this can all be trimmed to fit I think.

 

It may fit with some modification, but eBay offers a return guarantee right? Assuming it was advertised for the Rx7 I'd return it and get another. It just doesn't fit.

I've been running a generic eBay 3 core rad for a few years. It fits perfectly, but you need the stock rad brackets unfortunately. It wouldn't be difficult to make your own though if you have angle iron.