The New Nissens are not re-inforced with pipe inserts.

I recently bought a NOS Nissens with the pipe inserts for my 2000 MY W210 on Ebay for 100/- The original valeo italian made radiator was leaking ATF into the coolant.

Look around, you may find one or buy the new style nissens, they dont need the inserts according to Nissens themselves.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)